Since my first OLED (Galaxy s6) I'll never buy a phone without OLED ever again. It's a huge difference when reading stuff in OLED mode apps and at night. I'd never trade that for anything.
I don't think it's an issue with phones, as TVs and monitor have static elements for half a day or longer, phones tend to be one for minutes, maybe a few hours max.
My phone doesn't even have a hint of a burn-in after 3 years of heavy usage (Galaxy S10). I use it way more than most people, often 8 hours a day.