The long press/longer press mechanism for removing/moving applications is incredibly unintuitive, and there's no reliable mechanism to figure out which apps do and don't support this.
Swathes of bluetooth problems on an iPhone 8 (and previously, an iPhone 7). If you have airpods, this is probably fine, but they're not appropriate for the gym work I do. It's unacceptable to need to turn bluetooth on the phone off/on in order for the phone to actually pipe audio to a connected bluetooth device.
My iPhone 7 overheated while sitting on my desk and bootlooped. Apple's response? "Time to buy an iPhone 8"
The well-known performance degradation on older batteries to force people onto the upgrade treadmill, because the iPhone 7/8 are not fundamentally different from the 5S/6 in any way, and users weren't upgrading fast enough. There's no other explanation for Apple's behavior.
The "back" button hidden in the upper left corner (assuming the application supports it) don't close tabs in either Safari or Chrome. If you're reading Github pull request from your email and press back, the tab stays. Then you open Chrome and there are 50 tabs open for no reason.
Buying Kindle books is a 4 step process because Apple doesn't allow Amazon to sell products because :reasons:
Digging through 5 different alerting frameworks to get IRC messages forwarded which actually notify, since Pushbullet, Prowl, and friends have apparently not worked correctly after some API changes in IO9 or 10.
If you're heavily invested in the Apple ecosystem, all of this is probably fine. But if you're not, it's death by 1000 cuts, and it's not even a little bit of an intuitive or even good user experience.
My honest opinion is that it's Stockholm syndrome. Android has warts. iOS definitely has warts. Neither is perfect. But I'm tired of seeing people trot out how great the user experience on iOS is.