I’m curious about the better designed homes on your list.
oh yeah, no problem, I can go to town on this.
So I'm from California & we have "cathedral ceilings" in many new builds.
that means front door leads to a foyer type area with a ceiling maybe 4m above your head, it's a huge space that a whole 'nother upstairs bedroom could fit into but it isn't feasible to actually put a bedroom there. It's a huge wasted pointless space.
Many newer houses have an enormous (& I mean HUGE) master bedroom, with large en suite. Size >> excess of any couple's needs. More wasted space. Other bedrooms can be almost pokey in comparison. The houses may be structurally designed to not allow reconfiguration of the bedroom space.
One of DC was telling me how Americans adopted a lawn-expectation for their outdoor space & all the eco-problems that caused in American urban design, some video DC watched on youtube.
British kitchens are clever in how they squeeze in under-counter fridges. Your milk is designed to fit in one. Clever in how they squeeze in washing machines, dishwashers, all the kitchen basics. American kitchens in new build can be huge waste of space whereas many appliances aren't designed to fit in smaller older (American) homes so people have to put their appliances & half their kitchen equipment in their garages. Nothing you buy in Costco would fit in a small fridge, it's normal for Americans to have several upright fridges even in a household with only 2 people resident (AND a separate freezer). Not because the shops are 2 hours away, but because the assumption is everything you buy is supersized. We don't have small fridges that can fit a whole family's worth of fridge stuff in it. There's no logical place to line dry your clothes, or maybe it's banned in your area to do that outside.
American homes like American cars are often reverse Tardises: huge on outside & pokey on inside. Or lots of "luxury" comfort inside but nowhere to actually put anything bigger than a handbag (in the car, certainly). And so much pointlessly wasted space.
And then there's urban planning: it sucks. Britain can be mediocre at facilitating active travel in urban planning, but north American planning completely disregards the possibility. Irk.
One thing I hated about California homes when I lived there but now actually prefer, is garage placed out front of property, right at street, in front of the home. It's not people friendly or nice looking, but it's very sensible good use of space. And we have walk-in closets. I miss those, too, although they are part of a too-much-stuff culture.
I dunno New England homes, maybe they are all like the handsome mansion on Home Alone. Insulation or heating in California homes is notoriously not good.
So my cousin (marriage woes) is moving with 3 offspring (1 adult, 2 preteens) into her mom's 4 bedroom house, built 1948. My dad keeps going on about how "small" the bedrooms are & how aunt has too much furniture, they won't all fit. Biggest bedroom is bigger than my quite large English lounge (+ has en suite), 2nd & 3rd bedrooms are both (?) 16x16. 4th bedroom is about 14 x 10. All have closets. + extra bathroom, Living room, dining room, storage in a garage, & an old-fashioned size kitchen. Room to park about 5 cars on drive & lots more parking space on road. My grandparents raised 4-6 children in that house but it's "too small" now.