My mother is a master hostess. Everything I know about why a house matters, I learned watching her set a table, choose a menu and put exactly the right mix of people around it. Her position, which I have never found a reason to argue with, is that a table's job is to spark conversation. Everything else is logistics.
Which is why I have complicated feelings about the most popular remodel in America right now. The wall between the kitchen and the formal dining room comes down, the two rooms become one, and the reasoning is always the same. Nobody uses the dining room. It sits empty most of the year. It is square footage doing nothing.
I am not going to tell you not to do it. I have specified it myself and the result is often much better than what was there. But I am going to tell you what that wall was doing, because almost nobody accounts for it until it is gone, and three of the four things it did are recoverable if you plan for them.

The wall is gone. The room does not have to be.
What the wall was actually doing
It was keeping the noise out
This is the loss nobody warns you about and the one people notice first. A kitchen is the loudest room in a house. The extraction fan, the dishwasher, the ice maker, and every hard reflective surface in the place, tile, stone, glass, cabinet fronts. A wall kept all of that in one volume and your conversation in another.
Take the wall out and dinner now happens inside the kitchen's acoustics. People raise their voices slightly without noticing, everyone gets tired sooner, and the table empties earlier. If you entertain, this is not a small matter. It is the difference between guests leaving at ten and guests leaving at midnight, and I know which one I am aiming for.
It is fixable, but only with soft material. A large wool rug under the table, upholstered dining chairs rather than all-wood ones, full-length curtains at the windows even if you never draw them, and something absorbent on the ceiling plane if you can manage it. This is one of the strongest practical arguments for a proper rug in a dining zone, and the sizing has to be right or it does nothing.
It was hiding the aftermath
A wall let you close a door on a kitchen mid-service. Once the two are one room, everyone at your table is looking at every pan you used, and it changes the whole rhythm of the evening. Hosts start clearing during dessert. Guests feel obliged to help. Nobody lingers.
Design around it. Put the sink and the mess on the far side of an island, keep the run of counter that faces the table clear of appliances, plan for a scullery or a pantry with a door if you have any room at all, and light the two zones separately so you can dim the kitchen down to almost nothing after the food is out. Being able to turn the kitchen off is worth a great deal.
It was making an occasion possible
The argument that a room used six times a year is wasted proves far too much. By that standard, get rid of the guest room too. Some rooms earn their keep precisely by being different from the rooms you are in every day, and that difference is most of what makes an occasion feel like one. Walking through a doorway into a room that is quieter, darker and set for something is a piece of theater, and theater is not frivolous. It is a large part of why people remember an evening.
You can rebuild some of this in an open plan through contrast rather than through walls, and I will get to how. But be honest with yourself first about how much you actually want it, because if the answer is a lot, the better move may be to keep the wall and fix the room instead.
It was giving the good furniture somewhere to live
A dining room is where the pieces with the most presence in the house tend to end up. The table, the sideboard, the chandelier hung at exactly the right height, the mirror over the buffet. Those things need a defined footprint. Scatter them into a larger open volume with no edges and they stop composing and start floating.
How to keep a dining zone once the wall is gone
Here is the good news. A dining zone in an open plan can be entirely convincing. It just has to be built out of the four things that define a room when there are no walls to do it.
The rug is the floor plan
Nothing declares a zone as clearly as a rug, and a dining rug has one non-negotiable dimension. It must extend at least twenty-four inches, and ideally thirty, past every edge of the table, so a chair stays fully on the rug when someone pushes back from it. A chair with its back legs off the rug catches, tips and irritates everyone, and it also makes the whole zone look accidental. Measure the table, add sixty inches to each dimension, and buy that size. If that size is too big for the space, the table is too big for the space. There is a much fuller version of that math in how to choose the right size area rug.
The light fixture is the ceiling
A pendant or chandelier over the table is the strongest signal you have that this spot is a room. Two rules and they both get broken constantly. Center it on the table, never on the room, because the table is what it belongs to and everyone reads it that way. And hang it roughly thirty to thirty-four inches above the tabletop, which is lower than most people dare. Too high and it becomes general lighting for the whole open space, which is exactly what you were trying to avoid.
Put it on its own dimmer. The ability to bring the table up while everything around it goes down is the closest thing an open plan has to a wall.
Give the zone a back and a boundary
A sideboard, a console, a bench, a run of low cabinetry, even a pair of chairs facing in. Something that gives the dining area an edge to sit against so it reads as a place and not as the part of the floor where the table happens to be. If you can leave a fragment of the original wall as a return, or keep the beam exposed where the wall used to be, take it. A partial division is more useful than none, and a wide cased opening or a pocket door gives you the best of both, since you can close it on the nights you want to. The detailed version of zoning a shared space is in how to style a living and dining room combination so each zone feels intentional, which covers the layout side far more thoroughly than I can here.
Consider going round
Round tables are better in open plans for two reasons. They handle circulation gracefully, because there are no corners to catch a hip in a space people are walking through constantly, and they are better for conversation, since everyone can see everyone. My mother would tell you the second reason is the only one that matters.
The Southern answer, which is older than open plan
There is a version of this that Southern houses worked out generations ago, and it is the keeping room. A room next to the kitchen, smaller and softer than a formal dining room, with seating and a fireplace, where people gathered while the cooking happened. Not open plan and not a closed formal room either. Something in between that assumes the cook wants company.
If what you actually want is to stop being isolated in the kitchen, and I suspect for most people that is the real motivation, a keeping room delivers it without giving up the acoustics or the occasion. I wrote about how to create a keeping room because I think it is the most underrated plan in American housing, and it is worth reading before you commit to a beam.
The parts that need a builder, not a designer
If you do open it up, three technical realities shape everything above and they get decided early.
The wall may be load-bearing, in which case it needs engineering and a beam, and whether that beam is flush with the ceiling or dropped below it changes the room. A dropped beam is not a failure, and I would generally rather see an honest one than a flush one that cost three times as much, but you should choose it rather than discover it.
Everything hiding in the wall has to go somewhere. Wiring, plumbing, sometimes ductwork. That rerouting is the most common source of mid-project surprises and it is the reason a good contractor opens up a small section to look before quoting.
And the lighting has to be designed before the drywall goes on. Removing a wall changes how daylight moves through the whole floor, and the layered scheme that makes a dining zone work, the pendant on its own circuit, separate kitchen lighting, wall washing at the edges, needs to be planned while the ceiling is open. Retrofitting it afterward is expensive and usually a compromise. A professional kitchen remodel in the Kenmore area or anywhere else will bundle the structural, electrical and lighting work into one sequence, which is both cheaper and considerably less disruptive than doing them as separate projects. Solid Kitchen & Bath works this way, and the flooring is worth raising at the same time, since a visible seam between two rooms that are now one room is the detail that gives away that a wall used to be there.
One more, and it is the one people skip. Once the kitchen shares a volume with the living space, the extraction has to be genuinely good and it has to duct outside. A recirculating hood in a closed kitchen was merely inadequate. In an open plan it means cooking moisture and grease travel across the entire floor and settle on your upholstery, your curtains and your rug.
So, should you do it?
Open it up if what you want is light, sightlines and company while you cook, and if you are prepared to spend real design attention on the rug, the fixture and the boundary that will now be doing the wall's job.
Keep the wall if what you want is a room that feels different from the rest of the house on the nights that matter. That instinct is not nostalgia and it is not a failure to modernize. It is a preference, and the hardest thing in all of design is figuring out what you truly love as opposed to what you have been told you are supposed to love. Both answers are correct. Just make sure the one you pick is actually yours.