Optimum recently did a video on this. After 3000 hours his OLED got very faint burn-in of static UI elements. So it really depends on your use case.
If you'll use it to game for a couple of hours a day after work, it's probably gonna be 5 carefree years enjoying the wonderful OLED contrasts before you even start noticing burn-in.
If you (like me) need your monitors to stay on for the entire workday (and then some) - you probably won't be comfortable with the idea of starting to get noticeable burn-in after only a year of use.
Anyway, that's pretty much a dealbreaker for me and I'll probably be getting a MiniLED monitor instead. (Switch&Click recently had a video about this.)
I also like to buy stuff that will last ages, there are still monitors I bought in 2012 happily serving some of my family members. Buying something that will expire even if cared after seems... wasteful?