Posted By Hieronymus at 11:40 AM - Mon Jun 12 2017
Email addresses guarantee uniqueness, so at a minimum, using email eliminates the need for another field and bypasses the silly "black box" guessing game users confront when trying to register usernames on a large forum. Have you ever tried registering a "username" on a forum with hundreds of thousands of users? Giant PITA.
Using email address is the way to go. Your security concerns can be addressed in other ways, like two factor authentication (something Google switched to not long ago).
Makes more sense than the 'email is popular' response, thanks.
In response to your question though, I have easily picked a unique username on many other forum sites. Picking a visible name is hard if it has to be unique because I like real-seeming names, but usernames are easy because you can include numbers and make them long without worrying about being known by it.
I don't care if this site changes what they have going. Like I said before it is easier as it is (the less I have to remember the better), but op did kinda bring up a point that I thought worth a well discussed answer (at least among the community if not the devs).
But maybe its not the right forum section for discussion, so sorry for adding to the initial post.