Indeed there could and should be no compulsion to divulge ones physical location, but it would be cool for members to see who else is in their area if they do decide to divulge it.
When I joined the S4 society I was surprised to get a list of "people near me". Two chaps in Berlin.
I have found and visited a very nice gentleman and talented modeller (who is a non-posting member here) on a German language forum for British and Irish prototype railfans and modellers. He only lives about 30 minutes drive from me. When the pandemic is over I'm sure we'll see more of each other.
I'm in Brieselang, near Berlin. The Berlin-Hamburg mainline passes through here but it's not all that interesting. Mostly regional passenger multiple units, some regional push pulls, ICE trains and a bit of freight (mostly containers, the odd heavy coal train with double heading locos). Almost all electric. Very rare to see a diesel.