Besides the semantic usecases of Docker which can be infinite, technically docker is a virtualization and isolation mechanism. So whatever you do with docker can also be done with type 1, 2 virtualization or even processes and users (hint that's what docker is actually built on). There's plenty of junior programmers that learn to docker run something to isolate it without learning how to isolate with basic user permissions.
So the use case isn't really relevant when I say that you can live without docker.
In general if you ever find yourself complaining about your free stuff, I recommend that you uninstall it to show yourself you don't need it. And then you can reconsider to come back to it again from a place of gratefulness instead of demanding neediness.
