> That covers probably literally a majority of all software on your computer

If you're running GNU/Linux, chances are you'll have hundreds, if not thousands, of pieces of software that run totally unsandboxed.

Yes, a very small minority of applications are unfortunately primarily distributed via flatpak or snap, and the distributors don't care about the user experience, so it's error-ridden and problem-ridden, but chances are you can get a "normal computer program" version of it unencumbered by such grossness.

And tons won't be part of e.g. root, or dialout (to pick one I've had to deal with a lot lately), or many other more-privileged-than-default groups, yes. That's a permissions system working as intended.

Besides. They said "all software on your machine". That is trivially false, to a significant degree.