>If her phone was ringing and she picks up my device and authenticates it should answer the call.
Unfortunately Apple don't get to decide how SIM cards, phone numbers and the cellular networks work. So that's not going to happen. Note how the watch has to have a SIM mated to your phone to take calls on your number.
As for FaceID and TouchID, that data isn't supposed to be readable at all, it's never sent to iCloud so how would it get synced between phones?
Then there's storage, all the contents of all your family's devices would need to be syncd between them all the time, multiplying up the amount of storage each device would need. You'd completely lose control of managing storage on your own device. You'd also essentially lose control of wireless bandwidth utilisation.
It's a lovely dream and maybe one day we'll get there. None of these problems are unsolvable in principle, but nobody can wave a magic wand and make them all go away. I think in the same way secure resource and feature sharing between apps required Apple to develop Secure XPC, this would require a lot of fiddly, complex technological and infrastructure groundwork before it could be possible.
The Mac isn't receiving the call, the phone is. The Phone is just handing off the UI to the Mac across Bluetooth and Wifi. If the phones worked this way, if his wife walked out of the house with his phone, and let's be clear at that point there might not even be a way for her to tell she's doing it, it would drop off the local network and incoming and outgoing calls would become impossible.
FaceTime audio, FaceTime video and iMessage don't suffer that problem and I preferentially use those. The cloud storage of biometric data is a problem though.
Unfortunately Apple don't get to decide how SIM cards, phone numbers and the cellular networks work. So that's not going to happen. Note how the watch has to have a SIM mated to your phone to take calls on your number.
As for FaceID and TouchID, that data isn't supposed to be readable at all, it's never sent to iCloud so how would it get synced between phones?
Then there's storage, all the contents of all your family's devices would need to be syncd between them all the time, multiplying up the amount of storage each device would need. You'd completely lose control of managing storage on your own device. You'd also essentially lose control of wireless bandwidth utilisation.
It's a lovely dream and maybe one day we'll get there. None of these problems are unsolvable in principle, but nobody can wave a magic wand and make them all go away. I think in the same way secure resource and feature sharing between apps required Apple to develop Secure XPC, this would require a lot of fiddly, complex technological and infrastructure groundwork before it could be possible.