Don't wear your Apple Watch Series 10
The paint on the bottom chips off when worn and the support says it costs 370€ to replace it while the watch is still under “warranty”.

I would expect that they test the paint they use for a wearable product for chipping when worn. But I guess that’s too much to ask for nowadays, what happened to QA…
Update 02/26: I stopped wearing the watch because the software got too annoying and suddenly realized that my lower arm doesn’t hurt anymore (I wasn’t aware it was hurting before), the watch mark is still there though, four days after last wearing it.