This is standard in Europe. Yes, we should. Small, light weight, low cost, and "it's better to have it and not need it than to need it and not have it".
And tire jack/spare tire, and a reflector vest.
Instead had to wait hours for a tow truck and a replacement tyre.
Vest and first aid kit cost like €15, absolutely should have them - although I'm not convinced the typical "cut finger" first aid kit would be much help. Sure if you knick yourself changing your wheel (which of course you don't do any more), but I wonder what level of injury it's useful for when looking at a typical crash.