> I've never even seen burn-in on anything other than a signage TV, and that happens even on some LCDs
AFAIK, the hardware still suffers from that problem, but it's been fixed in most devices by software fixes. Instead of displaying the exactly same content 24/7, it has "cleaning programs" or similar to runs once in a while to prevent the burn in from happening. Our OLED TV does the same I think too.
Of course, and many devices also use various pixel shift techniques. My point is that this isn't really a drawback from the user's perspective. Saying "I consider non-OLED to be a selling point because it won't burn in" simply doesn't make sense anymore.
AFAIK, the hardware still suffers from that problem, but it's been fixed in most devices by software fixes. Instead of displaying the exactly same content 24/7, it has "cleaning programs" or similar to runs once in a while to prevent the burn in from happening. Our OLED TV does the same I think too.