Wait, you can like "hold" a door open? What, with your hand? I'm European and I've literally never heard about that. I thought slamming doors straight in other people's faces was a universal thing. Learn a new thing every day.
I kid, of course. But for real, what makes you think of door-holding as a uniquely American thing?
Out of the ten foreign countries I've been to in both Asia and Europe, me seeing instances of people holding the door open became as rare as me finding hyper-processed u.s.a-grade slop over the pond in either direction.
Stateside it was universally common in all eighteen states I've visited. It's just a form of the peculiarly distinct friendliness we exhibit here.
Where I'm from in Europe I think most people sort of think of it as just basic common courtesy, especially for older/disabled/people carrying stuff. At least, that's what's taught, but I wouldn't speculate on how often it actually happens here vs. the US. I did also once have a colleague from the US who was extremely (almost performatively, I would say) friendly about those kinds of small, polite gestures. So what do I know.
It's a matter of distance, if someone is like 40 or so feet away, that's a door hold, any further is outside of reasonable unless they're carrying stuff. It's nice but also if there's a crowd, it's efficient, everyone having to individually open a door that's closing on them slows things down and it's just a pill for everybody. If it's a big enough crowd do.thar thing where you kinda pass the door hold off to the next person behind you and move on.