Either you enjoy life or concern yourself with the possibility and potential that something someday may go wrong. It’s not like we are talking about one’s health or death cost, we are talking about consume electronics that will be outdated with a new model in a year or so. Seriously people need to just live a little and not concern themselves with every little aspect of hypochondriac syndrome 😝
I'm not sure why you're so set on telling people just not to worry about it, instead of providing accurate information and letting them decide for themselves.
I personally will buy an OLED iPad, but I'm not foolish enough to believe that all modern OLED is effectively immune to burn-in. Perhaps the OLEDs Apple will get for iPads will be nearly immune, but there is no guarantee that is the case, and some people would rather not be the early-adopter guinea pigs.
It’s a very small concern with “bright and static images kept on for a prolonged period of time” Even with an OLED monitor or TV and using it with macOS the menu bar and dock have the option for auto-hide/reveal. Seriously this burn-in issue has been overblown and seems to still be an issue for some paranoid just like battery drain/recharge on an iPhone.
It's actually a significant concern with gamers on OLED TVs for example, for good reason, as it is not really that uncommon occurrence an in that context when the screen is used at high brightness with static screen items for hours on end... cuz well... that's how a lot of gamers like to use their screens.
And yes there are things like auto-hide that can mitigate things, but this may require a change in usual practice for some people. For example, for a monitor, if it required dock auto-hide for macOS, that would be a dealbreaker for some.
IOW, OLED burn-in is actually a real issue that people should be aware of with some modern OLED devices, but it really depends on the specific technology used and the usage patterns. Regarding the latter, people generally don't use TVs the same way they use iPhones, but people generally don't use iPads the same way as they use iPhones either.