If Windows 10 has better accessibility for mouse+keyboard combo, then tell why. I already provided many examples why Windows 7 is much better.
Windows Key + Tab lets you see every single window open, and if you use multiple screens it shows it only on that screen. Very helpful for tracking down a specific window when you have about 30 open across 3 screens like I frequently do.
Windows Key + Arrow key snaps a window to the side of that screen depending on arrow pressed. May have been in 7, but not sure.
The ability to snap windows to the edges of screens that also share edges with other screens. It used to be I could only snap edges on my outer edges, but now I can do it on all of them.
Right click on start button in the bottom left pulls up a lot of administrative functions, including control panel. Settings is there and works for some things, but as you said Control Panel is better for more complicated things. Welp, it's still there and even easier to get to than before!
Also ability to get to things like Device Manager quickly is much appreciated.