Never trust user input. The users already can't modify the server.
And what actual applications did you have in mind that warrant throwing everybody under the bus? (by that I mean some applications (allegedly) need it, so it gets forced on everyone)
And what actual applications did you have in mind that warrant throwing everybody under the bus? (by that I mean some applications (allegedly) need it, so it gets forced on everyone)
That the laziest of us don't mind and the worst of us want something is not a respectable argument for anything, ever.
We can have a discussion about FaceID specifically, but “convenience” is not considered trivial within the security sphere.
Second, I work for a (very large) bank, and you actually do not want to trust them with your biometric data directly. You can be absolutely assured of the privacy of your biometric data with the bank, better than with a Silicon Valley tech company. But I would not trust the bank’s data scientists to come up with a model that will not have an extremely high rate of false positives and negatives.
The reality is, if such an initiative was started at a bank, it would be shuttered after years of delays.