I think it’s still a very real issue, even if it’s less of one than it used to be. I haven’t seen any phones or monitors with burn-in in person, but the only OLED monitor I see on a regular basis is my own, and phone screens pose less risk of burn-in in general, since they’re not getting used continuously for 8+ hours a day, nearly every day.
The issue is that when I have a lot of good energy it means I’m actually able to do, and enjoy, fun things, where normally I might be unable.