Nice write-up. I thought I had a large library (24TB) and my off site backup is starting to get full. I backup everything though but I have long debated on if there's a point of keeping movies and TV since they'll likely always be available. Anyway, I never thought of generating a list of files and eliminating the stuff that's not particularly important. Good idea.
Yeah depending on what OP wants to do with the machines. I've been gaming on Linux for over a year now on my desktop and haven't had any issues. Especially since they're using AMD cards.
I downloaded and tested as well and noticed right away there is no sleep timer which I use every night. I actually quite like the audiobook shelf app. It's served my wife and I quite well this past year.
I remember everyone saying "suck it" all the time haha. And then later just doing the gesture.