Each MacOS has over the last few years has made it harder and harder to parse down the unnecessary fonts in the System folder to the point where Big Sur has no work around to remove any of them. While I can recognize that the trade off has been a more secure operating system which I'm certainly not suggesting Apple doesn't continue improving, really would like control back over these system fonts in some way.
Some may think this is no big deal, but as a designer who is in fonts every day for multiple clients and using font management software to activate and deactivate fonts regularly, having a terribly long list of fonts always present hampers workflow.
Ideally via Terminal there would be a way to unlock functionality in the Font Book app Apple pre-loads to unlock the disable function under system fonts. I know which fonts I need to have my system run so maybe we can get a way to control these back some day??