If it's legal and Microsoft is ok with it, I guess I'm happy it exists!
When I was a kid I remember poring over all kinds of stuff to make my games run well on the family PC. CCleaner, Disk Cleaner, Disk Defragmenter, turning off a bunch of Windows services and processes in Task Manager, and... there was one other questionable program I can't recall, that disabled a bunch of things when you ran it, then re-enabled it when you quit. I had Malwarebytes and SuperAntiSpyware, and tweaked the registry a bit, IIRC.
My point is, it takes a lot of work to understand what can be turned off to squeeze out performance, but it sounds like something that benefits the user.