Does that mean it's a great idea?
What about losing the yubikey?
In any case it's a different matter when it comes to high stake scenarios, in which case I don't mind something slightly more sophisticated.
But not as the default for everything.
I know it's not your point and I agree with everything you're saying in this thread 100%, but DNA based login would be a username, not a password. Like all biometrics. And it'd have a really bad false positive rate if you're just doing restriction enzyme cut location tests like lots of "police work". A full exome scan ~$300-500/per might do it.
I have 5 yubikeys on multiple continents. If I lose one I can log in with the others and remove login access with the compromised yubikey.
Are you actually retarded or just disingenuous? This is hardly a workable solution even for security nuts, let alone the average person.