Ipads have been oled for years now. The samsung galaxy s has literally had an oled for 16 years now. If these screens aged badly, don't you think Apple/Samsung either would've switched away or built more burn-in resistant oleds?

Also brightness degradation on especially a tandem oled is unlikely within its reasonable lifespan. Tandem oleds are the literal peak of display technology for this size of panel. Image quality wise, there's no downside.

OLED displays now are tandem OLED displays which stack multiple layers. This means you don't need to exponentially crank up the voltage to provide more brightness which also increases lengivity of the panel (and increases battery life).

I have a, what, 2019 LG CX OLED TV. 55". Used in anger as computer monitor since new. With complete disregard for burnout. It's… perfectly fine? I can't see any dimming or patterns or faults at all.