If you would like to see what image burn-in looks like on an iPhone X, here is a photo I just took. I'm not upset about this, as it's not something you really notice unless on a mostly white screen (and I tend to use "dark mode" for most things).
Image burn in is a normal thing for all OLED screens due to the organic nature of the display. Over years it can happen if you use applications where a single part of the screen stays in place for long periods of time. This is why I chose an LED for our main TV, as I play a lot of games that have static components on-screen (and we keep our TVs for 10 years or more). I'm also happy with my MBP 14" LED screen, as if I had some sort of burn-in on my laptop display it would absolutely drive me nuts. And I'm pretty sure I'll still be using my MBP in 7 years. But on a phone it's really not nearly as big of a deal; and it's hard for a phone to last much beyond 7 years.
In the case of our iPhone X; my wife shot a number of long videos (45 minutes to an hour). During that time the camera app will show certain interface elements (like the button).
I started noticing the burn in when I would use her phone at around the 3 year mark, but didn't mention it to her (and she never noticed it or at least never mentioned it to me). No reason to point out something like this to someone who is enjoying their device; as it may be hard to "un-see", haha.
This is a well cared for iPhone X (still looks like new). I bought it at launch for my wife and just upgraded her to a 13 Pro. I think I will now use the X for a few years more. We tend to buy highest end iPhones and then keep them in the family until Apple no longer allow OS updates for the model.
Shot with a Canon 5D. Had to adjust the exposure to see what the eye sees; as it would be hard to capture this normally. Sorry for the hair in the corner; we have a dog and I'm too lazy to re-shoot. Ignore the moire; it's caused by the camera, and the exposure level. I could have probably done better with this photo if I took more time; but I figured this served the purpose.
Screen is at about 45% brightness. You will likely need to click the image or go to full screen on the image to see the burn in.
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