According to this article - whether you’ve got an entry-level MacBook with the bare minimum RAM or a tricked-out Mac Studio with all the RAM you could afford, macOS will help itself to using it all.
1. Is this true?
2. WHY would any operating system need to access all your RAM. WHAT is it doing?
https://www.howtogeek.com/mac-ram-usage-high-dont-worry-about-it/?