Anthony Sorace on Nostr: Y'know that web UI design pattern where when you log in you can only enter your ...

Y'know that web UI design pattern where when you log in you can only enter your username/email/whatever, have to hit a button, and can then enter your password?

Why?

There are several obvious ways it's worse for users, both convenience and security. As a developer, it also seems like more work to implement. Why is it so common? Is there a benefit I'm missing?