You would think that Apple would have fixed all bugs and performance issues by now since, you know, they've had a year to do it...
Apple started working on iOS 11 when iOS 10 was launched, the same way they are already working on iOS 12. So they have a whole damn year to perfect their software but no, they have to release buggy software and only perfect it when they launch the beta of their next iOS. Apple seem to have lost the plot, even their 10th anniversary iPhone is going to be a disappointment to many, with that horrible cut out at the top, Touch ID on the back. Apple has taken a big step backwards under Tim Cooks leadership.