- TouchID is already very fast
- I can give access to someone else with TouchID without giving my password
- It's unlikely that someone will be able to unlock my phone without me knowing it when using TouchID
- In case of coercion, I still have the possibility to give the wrong fingerprint 9 times before the good one
- I have to voluntary give my agreement with TouchID for an action (think apple pay)
All of that makes me think that they are trying to sell a feature that is only due to their engineering team unable to put TouchID on the Iphone X. By every real world metrics, TouchID is better in my opinion...