Siri can’t do basic tasks like turn on flashlight or wifi hotpot.
Voice recognition quality is much less accurate than Google's.
App store has poor search and filtering options.
App store fails to install apps and does not show errors.
Swipe typing is inaccurate compared to android. Gboard exists for iOS but it is clunky: it pops you out of your current app frequently and sometimes the default iOS keyboard reverts, despite Gboard being set to default.
No live wallpapers — boo! They’re fun. (iOS has them but they are video files, not apps.)
No equivalent to Smart Lock on android where the device stays unlocked when you're at home or when it detects you are carrying your device. Face ID, therefore, needs to be used super frequently as a result, which doesn't work well at funny angles or with the device in horizontal mode.
Possible bug: Battery won’t charge past 80% even when Optimized Battery Charging is disabled. My device has literally never reached 100% despite trying.
Safari is the unchangeable device default and I find it awkward to use with many tabs.
I'm just one user, but I was shocked to learn how good I actually had it on Android (Pixel 3 series.) I thought the grass was greener on the iOS side but it wasn't a clear winner.
I am totally on the fence as to whether to keep it. I love the privacy focus that iOS has but dislike the restrictiveness and features that make the device slower to use. (The smart lock is a huge deal to me...)