I think they finally got the flat UI correctly by adding some depth back. Comparing iOS 15 to iOS 7 shows a lot of improvements.What does “boring” mean to you? Do you believe a good OS UI should not be “boring”? What would have to change?
Give us an example of a UI that you feel is not “boring” so we have some context.
The icons on the Home Screen though are laughable. I can't believe they made it to the public in iOS 7 and I believe it even less that they kept them for 8 years.