As I would like to let several people use my server for location sharing, user accounts with separate password would come in handy. Consider the following advantages:

• Better security: no need to change the server's password if a user leaks the password or if the permission for a user to use the server is revoked
• Better compatibility: user accounts could be connected to other services (e.g. prosody in my case) with a single password per user for all services

Off topic:
Thank you so much for the development of this app and server! I had virtually been trying every location sharing app on F-Droid, most of them didn't work, were bloated, or I couldn't manage to setup the server. I was about to write my own application when I finally found Hauk!