Recent non-tesla rentals I've driven have definitely had functionality that could only be accessed through the touch-screen. e.g. a Chrysler my mom rented a couple weeks ago had just temperature and fan control on knobs; everything else for climate was touch-screen only. What happens when the eMMC gives up the ghost in this car? I don't know, but I suspect you won't be able to e.g. manually put the defogger on...
Ford and the rest of the reputable OEMs know a thing or two about flash degradation though. It was actually a huge sticking point in one of my infotainment projects with them. So I don't expect all the OEMs to make the same bone-headed mistakes Tesla has
Usually when talking with them they would throw around "lifetime of the vehicle" requirements. For typical OEMs I think they consider that 15-20 years. Tesla, probably 10 lol!
Though, in reality, if you baby your flash to last 15-20 years. You've probably designed it in a way that it has a chance to live a whole lot longer.
The issue is if OEM's ignore this limitation and tie mission critical portions of their systems to the memory partitions their diagnostic and logging mechanisms use (e.g Tesla).
In reality if we are deploying OTA capabilities to these vehicles, there is absolutely no reason to be hammering your flash with logs, just upload them to the borg cube and be done with it.