[quantified]

For all those apps, sign in on your car? Every time you start it, otherwise your teenagers use your accounts? Not appealing.

[Barbing]

Would have per-driver accounts like Tesla, right? (Privacy nightmare when thinking of every car someday requiring logins—very convenient! though)

[quantified]

Could be done, but either PITA or privacy nightmare or both. Key fob isn't your token, needs to be something else. Your fingerprint? And it won't be using your apple apps, no way apple lets those just show up.