Like when you send a .7z instead of a .zip or .rar to a friend or a teacher because that's what your computer has installed and they're like "Oh No, not one of those, now I have to install 7Zip" even though the same program that opens .rar also opens .7z I feel like people are way more annoyed when they receive a .7z
Wouldn't '7z x' handle all of the above as well?
Sort of.
7z xon a.tar.gz(or.tar.xz) gives you a.tar. If you don't mind running7z xagain on that tar, it works