> One simple reason I think is overall US is very rich so people just can have anything they need on their own and sharing small things which lead to more interaction is simply not needed.

That's a very interesting observation!

I have a theory that reducing "friction" is actually a net negative after a certain point, and US society is way past that point. But everybody keeps doing it, because they're myopically focused on little problems and don't see the big picture or down have a full understanding of all the alternatives.

People need external constraints, because those are the things that keep certain internal drives under control.

It's like when food was scarce it made sense to gorge yourself on calorie rich things and avoid physical effort unless absolutely necessary. Now that food is abundant and it's actually possible to nearly completely eliminate physical activity, we have an obesity epidemic, because those drives no longer hit external limits and are now out of control.