I have an iPhone that fell, and its fingerprint reader doesn’t work any longer. It simply cannot recognise my fingers, or it does recognise the finger once in like 50 attempts. I was unable to trace what I did and how much I pushed that sensor. I turned the biometrics off and use passwords instead. It’s less convenient, but I’m not planning to upgrade the phone for that very reason either. So I’m stuck with this for a while. I cannot imagine how passkeys are going to work in this scenario.
This, and also brand dependency, is what makes my worried about passkeys. If I got the idea correctly. It hashes my fingerprint data, but what if my fingerprint changes? I have that very often on my iPad that it stops seeing my thumbs as the correct thing. I assume that happens due to some manual work I may do. And my thumb becomes different to the sensor. I hack that with my pinky finger, for some reason it’s more reliable. But what if something happens to the sensor and it stops being reliable.
What are my options then? What are my options if I’m about to change my smartphone brand? What are my options if I’m on my PC that has no sensors for any biometrics?