That’s just bad architecture and poor insulation.
I briefly rented a 400+sqm (4300sqft+) house recently and was surprised at how well balanced it was. There were five bedrooms over three floors, the top one was nicely converted attic for two kids/guest rooms and a bathroom.
There was enough space for a couple of rooms on the ground floor with different uses (dining room, TV/chill out) and a beautiful first floor living room. It was lovely to “retire upstairs” to this in the evening for a glass of wine and a book, scrabble etc (rock and roll!).
I could live without the dining room (would probably use it as an office/library instead) but the space and layout was perfect. I could find uses for several additional rooms - exercise room, workshop, storage/junk, pushing it up to 450 or 500sqm easily, and that’s before getting ostentatious with swimming pools in the basement.
This has totally ruined my perspective on what constitutes a nice size family home (mine is 120sqm).