[JeremyNT]

Ironically, some devices (Pixel 9 at least) have now added a tiny little touch sensor exactly where the fingerprint reader used to be - it doesn't read the fingerprint, but you can regain this functionality by mapping taps to actions.

I can't even imagine why they decided to keep the fingerprint sensor on the front but add a whole separate sensor on the back.

[mortos]

Are you talking about the feature "Quick Tap" in the settings where you can double tap the back? There's no sensor for that, they just use the accelerometer to detect that input. It's been incredibly unreliable for me.

[JeremyNT]

I suppose so! I didn't realize that's how it was implemented. I guess that explains the... less than stellar reliability.