It probably is that popular among this crowd. There’s options to self-host your own Bitwarden instance IIRC.

I’ve started migrating away from LastPass and am using Bitwarden for new projects personally. LastPass is way better than nothing, but I wouldn’t recommend LastPass over Bitwarden these days.

What kinds of “various” admin level tasks are we talking about here?

A lot of desktop distros do have these kinds of tools in place. You can create and edit users and groups, set file permissions, create folders and files, download and update packages on your system, view disk usage, etc, etc. Shoot, specialized distros like gparted can be used to partition disks, or live boot a system to repair it.

But for a lot of things, building a GUI for the interface just takes so dang long to do, and takes so much more time and effort to get right than building out text commands, that it just really doesn’t make sense to make it as big of a focus.