OLED's have vastly superior picture quality and are easier on the eyes. I would say this is kind of the "4.7 inch iPhone" moment where Apple is finally giving iPhone users an acceptable screen at an "affordable" price. OLED displays have been dominant on Android phones and high end iPhones for a reason - they are so much better in picture quality.
OLED's are very nice, but if the phone is used for example as a car navigation, then burn in might be an issue. I am very sensitive to it, to the point that I am very happy having an LCD screen.
Not really, No. Not even WOLED from LG can say that on their TV.
On mobile phone it is mostly dodged simply because you dont have the same screen for a long time and your screen time tends to be a lot lower than on PC.
But you can, definitely get burn-in on all modern OLED. And likely an unsolvable problem in the foreseeable future.
I suppose our experiences differ. I've tried using Pocket at night on an amoled screen and with dark mode, but because it's real black with bright white text I can't tolerate it for long. Would prefer a dark grey with white text, or even a navy blue with light yellow