Truth is that most people using a PC will not be aware of the upgrades under the hood. To the average users which represents a significant majority, it’s mainly a facelift of the UI with some sales pitch from MS about improved security. Does it make the security bulletproof? I don’t think so. And the tank in performance especially in CPU intensive situation is quite obvious.That's only because you're ignorant, no worries.
I feel the general problem nowadays is that any update in OS tend to focus mostly on UI and UX. I feel it’s more towards the looks on the UI since they are hiding useful buttons here and there, and it takes a few clicks and swipes before you find the button for the feature. And more than often, the improvements in UI comes at the cost of higher hardware requirement if you want to maintain the same level of performance. The view seems to be that hardware will get faster, so will eventually make up for performance deficit. So with each gen, we see hardware getting more power hungry and/or resource hungry to keep up.