It’s not widespread at all, in fact if you took the time to search right here on this forum you’d notice that no one‘s complaining about Burn in on the X. Kudos to Apple.
9 months all is still good on mine. I also LOL’d how you think the XR is an upgrade to the X. You don’t need to justify why you’re looking at an LCD screen, it’s your choice, we all know OLED is better. Burn in is not an issue if your responsible.