I have worked on OS, operating systems for a long time, working on System 6 & 7 at Apple, then Windows 3.1, 95, 98, NT3.1. NT3.5, NT4, Windows 2000, Windows XP and Windows Server 2003. Watching mobile OS efforts from Apple, Microsoft, Google, Palm and others has too many times been by a small team. I bet you the iOS team is bigger than the MacOS team, and it is more exciting and challenging to develop iOS features than MacOS. With all the new hardware showing up in iPhones and iPads there are more changes than any Desktop hardware. Who would build a better camera into a Laptop?
There are plenty of reviews out there on iOS 11 and many are saying how good it is and how it is a desktop replacement. http://www.trustedreviews.com/reviews/ios-11
iOS has better multitasking, 64-bit only, File Manager, Multi-screen, drag and drop, and many other features you would expect from a modern operating system.
I can now do something I always did on my Mac and screen grab and insert the image. Below is some research I am doing on the gray zone and found some good papers written by strategic analysts.