That whole CPU thing... I was lurking around on the X4:Foundations boards for a while and ended up having to explain the whole 'single thread' thing quite a few times. People buy these 12-core monsters then look at Task Manager (or whatever) when the game tries to save. The save takes 45 seconds and the CPU only ticking along at 10-15%. Well, yeah, it's a single-threaded process so you are only using 1 of the 12 cores. They aren't happy about that.
I think I have to disagree on the NVMe thing, though. My PC boots up CRAZY fast now that I have one! A 1TB NVMe for Windows, your save files, and maybe a game or two to live on should prove valuable - especially when DirectAccess* shows up. He's right, though, in that games are only helped somewhat. Starting up a game is more than just loading a bunch of files (especially starting one for the first time), so don't expect it to be crazy fast on that front. Do NOT go nuts and try to cover all your storage needs with NVMe, though!
And how big are those needs, really? If you've got a fast, reliable network, you don't need to install a bunch of games "just in case you want to play one." If you get the urge, just re-install the thing and you're ready in about five minutes.