Flatpak and Snap are new to me, and that's the annoyance. Like I get if there's some technical advantage to a snap, but apt can install snaps too. Also idk what .appimage is.

rpm was a thing that existed but wasn't a Mint way of installing. Tar, yes. I can see why you'd consider a tar a package, but I was thinking of things actually designed for packages, and tar isn't really an extra thing to learn and deal with. Port tree, idk never heard of that.