When are sites like yours and others going start tying the e-mail address to a user instead of some unique name! your login process is beyond stupid and tied into a method i saw back in the 90s instead of doing something simple and allowing us YOUR USERS ease of access.
FIX this crap!
It much more constructive when you write polite posts.
Since your login name is visible to other users and bots alike, it’s a bad idea to use your email address as login name, unless you like to get spammed.
But I assume nothing prevents you from using your email address as login name.