Ask HN: Why are we still using passwords?

It has been a while since I windows introduced login with fingertip. iPhone also uses fingertip for unlocking.

While the possibility of using facebook/twitter/google/github login in multiple services decreased the need to create more logins/passwords we still have a huge number of logins.

Besides that, the password may easily be guessed/stolen. Even with 2 factor in some services (like github and google), recovery codes exist and can be stolen.

And about fingertip? Why is not being implemented? Why can't I login with my fingertip on email, facebook, HN, or whatever? And I don't remind of having read that some big IT player intends to implement it.

Is it due to security issues on saving a fingertip to a database? I find it hard to believe that it is impossible to implement some protocol to prevent that...