Installing packages is a completely different activity than passing around self-executable archives among friends. Not everything needs to go through a CI pipeline and distribution platform before you can share it with others. On top of that, I really enjoy being able to write quick little utilities and then pass them around without worrying about what operating system anyone who stumbles upon it has.

It's fine if you don't personally find it useful for your workflow, but I think it's mad cool, especially since you can zip together multiple binaries into one, along with data.