Not all Americans are. None of my students used a yoke valve during their training. Always, always, always avoid absolutes!!!
I figured it might be. Sorry, not sorry.
Miriam Webster's second definition of pigeonhole (v)
: to assign to an often restrictive category
: CLASSIFY
It's when you put everyone in a group into the same category when not everyone in that group fits into that category. It's the source of all prejudices and a lot of disagreements.
As I've already debunked the safety aspect as being moot for the vast majority of divers, I would also suggest that I have never heard size and weight cited for why a DIN might be better. The differences are minor in both, especially in the water. Also, size and weight would be features, not benefits. I don't see a substantive benefit to either feature.
Again, time and money are probably the driving forces behind the yoke being more popular than DIN.