If Continuity Camera exists then what stops Macs from using an iPhone's FaceID for authentication along with login passwords and TouchID?

[Oneechan69]

You can mount your iPhone up to use the back camera for Continuity Camera, but what if you could use FaceID on iPhone while mounted for login and authentication on macOS? It seems feasible, the iPhone would do the FaceID processing and give the mac the go-ahead for authentication. It would be faster than reaching for the Mac's TouchID sensor or typing your account password.

 

[iStorm]

I don't think it'd be that secure. Someone would just need to hold your phone in front of your face, make you look at it for a split second...and now they're in your Mac without you knowing.

What you describe can already be done with the Apple Watch. The Mac will unlock automatically if you're wearing one. In cases where you need to use TouchID or type your account password, you can just double-press the side button on the watch instead.