Of the iOS updates I’ve used, iOS 11 has been the worst one by far. I know some of the issues are due to my phone, but there are visual glitches, broken compone

Of the iOS updates I’ve used, iOS 11 has been the worst one by far. I know some of the issues are due to my phone, but there are visual glitches, broken components (playing music won’t actually show in the Control Center until restarting phone), messed up keyboard inputs, poor battery life, and poor performance in general that seemingly are software only. I’m almost certain that they took more experienced engineers away to other projects and left the less experienced ones with iOS, and possibly downsized the team, based on the seemingly obvious issues. I’m also sure they were testing so hard for iPhone X that they didn’t test for older devices so much. At least the 10th anniversary has passed, so I’m hopeful for next year actually being a good iOS update again. For the people who down voted me, why?