The situation is improving, just very slowly. Solutions are slowly being figured out to various usability issues created by sandboxing (for example, there has been discussion for a while regarding how to solve the game controller issue I mentioned), which will allow the more user-friendly solutions to be more hardened by default. Also, even though I have many issues with Flatpak, with a bit of configuration (even graphically with Flatseal) it can effectively sandbox many programs already, as long as you use Wayland.

On the MAC front, there is a 3rd party project (apparmor.d) that’s trying to build a portable set of AppArmor profiles for all common programs/environments on desktop Linux. As you might imagine this is a huge project and far from done, but it’s actually surprisingly complete already.