Pros:
Harder for a hacker to compromise an account.
Wouldn't be that hard to code (wouldn't you just need a custom required field?)
Cons:
Browsers won't be able to remember the email field.
Users might get annoyed at having to re-enter it each time they log in.
Increases likely hood of a user getting locked out of their account due to typos.
It's an interesting idea but I'm not sure it would catch on. People today are getting lazier and lazier and having to enter an email address each time they logged in would be the biggest hurdle to get past.
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