I was thinking about that when I was dropping my 6 year old off at some hobbies earlier - it’s pretty much expected to have learned how to ride a bicycle before starting school, and it massively expands the area you can go to by yourself. When she went to school by bicycle she can easily make a detour via a shop to spend some pocket money before coming home, while by foot that’d be rather time consuming.
Quite a lot of friends from outside of Europe either can’t ride a bicycle, or were learning it as adult after moving here, though.
edit: the high number of replies mentioning “swimming” made me realize that I had that filed as a basic skill pretty much everybody has - probably due to swimming lessons being a mandatory part of school education here.
I live in a ski town that caters to the Los Angeles crowd, and I feel you on all that. 4 wheel drive does not mean 4 wheel stop lol. We are lucky in that we don’t get that permafrost y’all get up north, usually the roads dry out a few days after a snow storm so snow tires aren’t mandatory up here. But the number of overconfident goofballs in the winter is way too high.
The big one I can think of are snow rated tires, most people have plain old radials that don’t do squat in snow. And then you have people that don’t know which axle is their drive axle and that’s always fun to watch. Thankfully I have a two door wrangler with all terrains that is a breeze to drive in snow, very rarely do I have to chain up.