And it's understandable. iOS 11 made my iPhone 7 - the newest one at the time - so unusable I sold it and got a different phone. It went from a good, snappy phone, to a slow mess that took seconds more to open or switch apps, crashed all the time, had UI glitches all over the place, and was so slow it couldn't play locally downloaded audio without stuttering and slowing down. Ew.
I always cringe a bit when there's an update because the companies never provide any way to downgrade if you're not happy after.
It's not only Apple responsible, I wish there was some kind of consumer protections.
There should always be a way for a consumer to get a product back to the state is was at the time of purchase.