With the catch that it works like a finger meaning fat and imprecise. A stylus like the surface has is more like a pen and needs hardware in the tablet to function.
Dumb question: isn't it irrelevant for the malicous party if it's 78 or 87 per your example, because the login only checks the hash anyway? Won't both numbers succesfully login?
It depends. I get your point but there are a lot of questions to which answers change over time and a restatement of the question can lead to a discussion about new and better ways to answer them. Plus if I'm new to something I often simply ask the wrong question. Something a knowledgable human recognizes, but google does not. So a better answer to basic questions often is 'google this not that' making it way easier for the new person to find the answers.
Oh my. I'm blushing.
But it is a game changer