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Neither of which are as rare or as hard as you might initially think. Any fine art graduate is sufficiently good at forging signatures to pass any detection, given practice and an original. Anyone who has ever seen a cheque, or an online signature scan (often attached to emails or in databases, which are sometimes breached) would have access to an original.
So for example, have you ever signed for a package with Fedex / UPS / Postal? Your signature is a) being handed to a low wage employee, b) in a database to which millions of employees have access, and c) in a database which could be breached by hackers - potentially jeopardizing billions of accounts. Now, if every account required a signature - every companies database/employee would be a potential exposure to your signature.
Beyond that, one of the ways you actually detect a signature forgery is that they are often 'too perfect' - as in a trace or photo-copy. No matter how consistent your handwriting is, under a microscope it will always be slightly different - unless its a xerox. We're honestly better off with encrypted passkeys
Fingerprints and biometrics are also kind of dodgy - they sound super cool and high-tech - but their best advantage is their rarity of use. If everything required a fingerprint scan, you can bet crackers would buy a lot more baby powder / butter sticks Not to mention, I bet with a sufficiently high quality phone camera (or go pro, or google glass) - you could probably scan the iris of anyone who looked at you.
How many passwords are still "brute forced" these days?
“Do not lose time on daily trivialities. Do not dwell on petty detail. For all of these things melt away and drift apart within the obscure traffic of time. Live well and live broadly. You are alive and living now. Now is the envy of all of the dead.” ~ Emily3, World of Tomorrow
Words to live by.