I can’t imagine living in a house with a formal living room and dining room in anything smaller than 3500 sq ft. You certainly will have a cramped kitchen, and then it’s weird because the people cooking or prepping are separated out, and likely the dining room is a bit cramped.
It’s also unused for 90% of the year. Many of my friends who live in older style houses have turned either the formal living room or family room into a not so private office, which is less than ideal.
On the other extreme though you have my friend who bought Genoa, and it’s basically a small 4 bedroom floorplan stretched out to what, 4100 sq ft? Comically large bedrooms and bathrooms, a medium sized kitchen, and a huuuge great room. Definitely would have made sense to have more smaller rooms in that floor plan though.