I have lived in both places (UK/US/EU). I didn't realize how many problems could even exist before I went to the US! A trivial example: Forgetting your card in

I have lived in both places (UK/US/EU). I didn't realize how many problems could even exist before I went to the US! A trivial example: Forgetting your card in the ATM - in Europe you have to take your card before you get your cash, so you can't forget it. A very simple UX tweak that solves the problem, that is mandated across all ATMs. Yes a trivial problem, but emblematic of the two different approaches.