I have open reports to Apple from 10.0 beta 1 that still haven't been fixed. Reporting to Apple is no guarantee they're actually going to do something about it. The QC on their software has flat out gone down the toilet since iOS 7. It just has. iOS 6 and below didn't have a public beta program and didn't need 3-4 .x releases to get it right. It was mostly good in the X.0 release and then there was an X.1 release a few months later to iron out the remaining bugs.
I was willing to give Cook and company a pass with iOS 7 because they basically threw out the entire OS and started over. iOS 7 was a buggy sack of crap (especially on iPad). But so was OSX 10.0, which was really the last time Apple did a complete UI overhaul. So, I kind of expected it and let it go. But we are now 4 years on and with iOS 10, the amount of bugs remaining in the OS at public release time is just flat out unacceptable. Hell, even the new TV app doesn't work right and we are presumed to be at or close to the public release build. Apple has a ton of cash on hand. Could it not use a little bit of it to ensure better QC in its software?