Also, I swear the rear-facing camera has lower color saturation and higher sensoe noise after the upgrade. I’d love to see A-B camera tests for iOS 10 and 11 on old hardware.
My latest annoyance is when I'm using the keyboard and it just visually freezes for several seconds. It appears locked-up, but it's really not. It's silently recording every button you press in anger, and finishes with the throwing of the entire buffer contents at you all at once, which, to add insult to injury, you now have to also delete.
I bought a very expensive phone that was unable to launch apps (50% of the time, when it did, it took several seconds) and unable to make calls (the receiving end would be mute and would not hear what I was saying).
The phone was bought on an official apple store and had one day of use. Problems persisted for over a week. Tried all the possible solutions. The only one that worked was downgrading to 10.