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You're plastering your fingerprints, aka "keys" over everything you touch. A sophisticated criminal could steal your pint glass and phone at an eatery when you're not looking. There's a chance they could pull your prints off the glass, recreate them on a substrate, and then unlock your phone.

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Sure, but it's about a million times more likely that they won't bother with the fingerprints and will just sell my phone for parts.

Nobody is going to be lifting fingerprints off of pint glasses to unlock a phone unless they think there's something really valuable on that phone, and that means "a determined adversary who targets me specifically."

Don't keep nuclear bomb plans or thousands of bitcoin on your phone if you're going to protect it with your fingerprint. But mundane e-mails and such? Good enough for me.

https://xkcd.com/538/

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