IMO there are some extremely questionable design decisions in 11. Some of these are just ugly (like the super bold date on the calendar icon) or wasteful of space (like the headers), but others hide useful info or decrease discoverability (like requiring force touch for normal flows).

I’ve only been using it for half a day but right now the details feel sloppy and the bigger picture UX feels poorly thought out.

The wildest thing to me is you'd think this space would be used for the "forehead" on the iPhone X... but it's NOT: https://developer.apple.com/ios/human-interface-guidelines/o...

There's actually just even MORE wasted space

To add to the list of questionable UI changes, they are continuing to push iMessage Apps and there is no way to remove the icon from the input bar. Now with iOS 11 they have added an additional bar whether you use any apps or not.