It's "meh" level of quality, though. Useful for a very small subset and I would avoid it, if you're running a home server. (Cockpit's file server interface plugin is old and bad)
I don't really know what you'd use it for? Maybe to do minor monitoring, but it's not great to admin.
Exactly. No idea why RH is endorsing the project. There's no practical use. Listing bunch of systemd services isn't going to be any more helpful than CLI output listing everything.
I don't really know what you'd use it for? Maybe to do minor monitoring, but it's not great to admin.