Admittedly I've never used Mac's implementation but I could see a slowdown if it takes longer for the fingerprint to register that it takes to type your password (which is probably the fastest combination of characters you can type)
Also it's arguably not the fastest combination of characters I can type, because my password is not "test1234" and I don't get much opportunity to type it at all anymore since everything can be unlocked via TouchID except the terminal, or so I thought at least :)
I always just re-assign the caps-lock key to CTRL.
You mean the black void where there’s no feedback on how many characters you typed? I always have to write my password a couple of times to get it right.