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What are the reasons? Genuinely interested as I'd like to understand in more detail.

For the same reason that thumbprints are usernames, not passwords: http://blog.dustinkirkland.com/2013/10/fingerprints-are-user...

Previous HN discussion: https://news.ycombinator.com/item?id=6477505

I'm confused. I never stated that a users face should be used as a password. I was suggesting that their face (or other bio-info) be their username. Am I missing something?

"I was suggesting that their face (or other bio-info) be their username."

What problem does this solve?

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