Yes that is also one additional point - people will pick pin like 0000 or 12345 not to forget them which makes pins in general less secure.
Some people would set their pin the same as their debit card just to remember one number instead of multiple.
That is why finger print unlocking is quite great for day to day use.
Of course it is not enough for more complex security scenarios, but as someone else mentioned lock on my doors is quite easy to pick but still it is good enough for most of people.
That's what meant, mistyping or forgetting your PIN under stress is plausibel, but you can always face unlock or make a iris scan.
You don't even need to be conscious to do it.
