This is a recurring topic every time there's the concept to acquire sensible data.
I do believe we, as designers, we should be brave and keep pushing this kind of approaches.
A few years ago a feature as payment with a fingerprint was considered insane and not secure.
Now some of the best experience (at least here in CH) are provided by such kind of apps.
Save time, save effort, easy to learn and sometimes paying for something it's even cool!
At the end, this could be a shortcut to store data.
You could present two versions of the same feature (like Apple does when you configure iPhone for the first time).