When I look at the URL to my profile I see https://meta.stackexchange.com/users/344066/jack-siro. I want to believe that 344066 is my userid or member number and jack-siro is my username all automatically generated by the system. So why not have me sign in with my username like we do on all other sites like Facebook, Twitter, and so forth.

I would like to be using my username to login to SO. The system can make us have unique usernames to use to login with.

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    It is not your username but your displayname. Those are not unique on SE. – rene Apr 2 '19 at 8:29
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    Suppose this is implemented, what do you suggest the current nine-thousand or so Alex's should do? – rene Apr 2 '19 at 9:05
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    User names on sites like Facebook, Twitter, etc are unique, equivalent of the numeric user ID we have on Stack Exchange. Even Facebook and Twitter won't let us sign in with the chosen display name, which you refer to here as "username". – Shadow Keeps Social Distance Apr 2 '19 at 10:16

Usernames/displayed names are not unique. There are at least 3 users with the username "Gandalf" - it would not be trivial to determine which account to log into.

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It is not an auto-generated username. It is your "display name" which can be edited under the "Edit Profile & Settings" tab. Since it is not unique, it cannot be used for signing in due to the apparent ambiguity.

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