Burn in is 100% a problem but apparently it was a bug causing the issue in the picture. An update was recently released and users with the problem are reporting that it’s completely gone.

Burn in should take an incredibly long time to develop and it almost never looks like it does in the photo. This YouTube playlist shows a guy experimenting with a switch oled and it takes a long time to see an issue.

That would be fine. I already use a sideloaded version of YouTube.