I completely concur - though I HAVE gone into my system configuration and changed some devices to disable them, and power management options, as well as core-parking, but that is the extent of what I have done since Windows 7 - I am now on Windows 10, with the Anniversary Update applied.
A LOT of information for tweaking is for Windows XP, and Windows 7. Much of it does not need to be done anymore, with the exception of the above settings changes I made, and splitting file groups across multiple data drives.
But yeah - I would take it back to a pristine Windows 7 environment, fully patch current, and THEN take a look at what things make sense for your CURRENT OS version, to be very judicious in choosing to make performance modifications, as internal processing and hardware technology advances rather rapidly, so some things become poor choices, and other choices arise.
Bob Bone