Burn-in likelihood has to do with the user and OEM, not just OLED materials.
From improvements in the efficiency of OLED materials to software developments and new testing techniques, OLED burn-in risk has been lowered. OLED monitors are generally a more sound investment than ever—at least for the right person.
Burn in will always be a problem, you can't get rid of it. Sure there are ways to minimize it and monitors can try to hide it, but eventually you will have a task bar, window borders, and desktop icons burned into the screen.
It's in the "nature" of OLED that it eventually wears down. My understanding is that technically, it's not burning in, but burning out, and what's perceived as burn-in is irregular wear of the different color channels or different brightness of the individual pixels (especially with HDR content).
Sure, but it's more pronounced on OLED displays. We'll see how microLED ages once we get some mainstream panels, but as most other display technologies are evenly backlit over the whole display area instead of the pixels emitting light on their own, they wear evenly and the subpixels/color channels don't wear.
That’s true, but at the same time LED TVs have a huge problem with bloom issues that are essentially a lottery because most manufacturers don’t consider it an actual defect and won’t replace it.