I live in a house with an open plan and the author of that article couldn't be more wrong about my preferences. An open concept is key to making a house usable to me.
Now, I do like it if it's not the case that my dirty dishes are literally the first thing you see from literally everywhere in the non-bedroom, non-bathroom parts of the house. Modern SF remodels often have a kitchen that has no separation of any kind from the living/dining areas, and that's not ideal. I am not a domestic god, I do often have mess in my kitchen.
But going from there to a fully walled-off kitchen, even if it has doorways instead of doors, is even worse. In any social event, someone is going to be in the kitchen some significant amount of time. Some significant amount of the time I spend just hanging out with my family is me cooking or cleaning in the kitchen. I don't want enforced isolation during those times.
Plus, a little nudge to not let mess pile up in your kitchen is a good thing.
In my ideal house, the kitchen is open to the living/dining across a wall or archway, but has its own nook that it retreats back into so that you can at least not have everything in the kitchen be front-and-center all the time.
Dining rooms per se are even worse than closed-off kitchens. They're a big waste of visual space. I am not Victorian, I do not have big formal sit-down dinner parties. Most of the entertaining or hanging-out space is the kitchen and living room, the dining room should be as fungible with that as possible.