That's true, people always dismiss burn in as just image retention, but burn in is derived from prolonged image retention in one particular spot imo.
Back cases, as we all know, is a huge heatsink. I noticed some rugged cases really traps the heat on the backside. Those thick rubber ones in particular.
So baka ok lang naman yung tempered glass, yung backside lang tlaga needs to be air cooled as much as possible.
Oled TV topic pala neto and not oled screens hehehe