I’ve not looked into fire jail in depth but I’ve read lots and lots of bad takes on it
What we need is docker with a better graphics integration, in terms of both ease of use and security. maybe wayland can help in that (cause with X you just forward the whole management socket and that’s it, anyone can draw anything)
There’s a chance that snap has done it right (I know that everyone hates it but there’s a CHNACE that they got it right in terms of security and ease of use)
flatpak “is not enough” since the controls it gives you are not enough. first you need flatseal to disable stuff per application and the defaults aren’t good enough and steam for example REQUIRES access to the whole home folder which defeats the whole purpose