The last time I tested Windows 7 on a CPU with more than four cores it had serious issues. Most notably were the BF3 issues where people would need to use a hack to park cores or even disable Hyper Threading, it was that bad.
AMD CPU support was also notoriously bad in Windows 7 which is why AMD courted Microsoft with Win 8 to make sure they worked properly. You could gain up to 20% using Windows 8 and I actually put that to the test myself using 3DMFS where I got a 17% better Physics score using 8 over 7.
In order for Intel to support that sort of stuff with 7 it would need a pretty serious rewrite. Well, at least the Kernel would. Which is what Windows 10 is, only with a newer front end.
So even if they did sort out 7 you would be no better off.
I don't understand this "Hanger on" mentality, trying to hold onto something from the past like it's some sort of demigod.
There are plenty of ways to remove all of the stuff from Windows 10 that you don't like.
And yeah, Windows 10 has been awful lately. They launched a major update that just utterly screwed my PC up (crap internet performance, missing Windows, AMD CCC vanished from my system tray along with my Alienware app and so on) but it was fixed within 48 hours.
The same stuff used to happen on 7 too, that is why it got a service pack.