It still connects your online identity with a physical address associated with you in some way. That's a lot more info than an email address alone ought to supply.
Just like with social media networks, one may have multiple accounts with different rings of contacts. One ring might be people they know in real life and another might only be online "friends" they don't really trust with knowing their real identity.
I just wouldn't recommend using your callsign as part of your primary email address that you use to associate with all your online accounts.