Yes, but two users can't be changing/updating tags at the same time.
I think they can as they do have separate libraries.
Only if they write tags at the same time to the same file, a conflict will arise.
Wonder how often this will happen.
But I agree, Musicbee is not intended to be used as a multi user app.
the other PC won't reflect them until a refresh is done.
I often update tags outside Musicbee. I have Musicbee set to monitor folders on startup.
Musicbee is pretty fast in detecting these changes.
One might decide to change this to permanent monitoring in case of shared audio files.