Everyone knows OS and software, browsers, etc all use way more RAM than they used to, and arguably more than they rightfully should. Bloatware, etc.
I saw something recently that alleged MS puts a lot of shit into PCs that say they are doing one thing but are really doing another.
It would be wild if they are basically using the PCs of the world to do something like crunch numbers, mine bitcoin, etc. Oh, hey, this guy has 12 gigs of ram and is only "using" 4, that's 8 for us to sap.
Cachy and Bazzite are both flavor of the month, but heck if you don't need what they offer Ubuntu or Fedora give you long term stability or Arch gives you full control.
If you want someone who just wants a working operating system with which he can game to tweak Ubuntu and Fedora for gaming or God forbid build his own Arch system then yes Cachy and Bazzite are merely flavors of the month.