Most people (myself included) don't suffer from eye strain. Personally, this includes not only my and my wife's phones, but our 4k OLED tv as well which is viewed regularly by the seven people living in our household. I know some people have an issue with it, but they are in a rather tiny minority.
Color shift is only an issue when viewed from off angle, something very few of us do on any regular basis. Also, as I've posted links to in the past, the color shift on the iPhone's OLED screen is significantly less than those of other phones. A nice benefit of Apple having had the screens made to their own specifications.
So far, zero burn in issues on the iPhone. My own anecdotal experience supports that as well.
The entire industry is moving/has moved to OLED over LCD. LCD is the old tech, OLED has pushed it out of all premium devices.
To be clear, I don't care if someone is comfortable with their LCD screen and prefers a device like the XR over the XS/Max. I'm not making my comments trying to convince anyone to go with the device I happen to prefer ... but I will comment when people pretend OLED is, generally speaking, inferior to LCD for the popular use-cases (phones, TVs, etc), because that's objectively not true.