For me Proxmox is mainly a means to be able to have more than 1 pet (partially for simplicity's sake of not having to make everything play well together in the same install, partially because I have some things which require Windows and some things which require Ubuntu).

I guess I do also sometimes use it for ephemeral things without having to worry about cleaning up after too. E.g. I can dork around with some project I saw on GitHub for an afternoon then hit "revert to snapshot" without having to worry about what that means for the permanent stuff running at the same time.