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I don't think the parent comment is saying don't use the built-in user model. The comment is suggesting to sub-class/extend the built-in user model. So you can use much of the built-in functionality and add/change what you'd like, eg. to add a birthday field

There are obviously other ways to do this, perhaps by creating a Profile model that relates to a User.

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Yes. Technically you should extend the abstract user model or things get real broken real fast, but that still gives you all the functionality of the built-in user model right out the gate.

The main reason is that if you ever want to change how the username works, it will be a major pain to do if you've been using the built-in user model and already run migrations.

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