It would be useful! Personally, like many trans people, I juggle a way too many different e-mail addresses (cuz it depends who's asking). I'm not at risk of forgetting what's my main page's username, and my password manager knows what e-mail I use to log in — but I certainly don't remember myself which address I use for Cohost.
There are technical and security reasons why we don't allow login with usernames and we do not intend to change this. Please use a password manager.
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