Comment by jimktrains2

> non-rigamarolish process of sharing a HomeKit home key

I have not used homekit, but from some searches it only seems to be a non-rigamarole process to add someone as a homekit user if the other person has an apple device? Also, is the Internet required to enroll someone?

> ones where the key holder is so incapacitated that they would be unable to share a physical key.

I don't need to be conscious or my phone have battery (or reception) to have someone take a key from my pocket.

> Also, every implementation of CarKit Car Keys I have seen is the same as HomeKit home keys: there is a backup. Either a physical key, PIN, fob, or card.

I was responding to gp who wanted none of this as it all defeats the security they desired. A 1-factor physical authentication token as a backup would be suitable for nearly all edge cases I can think of. As long as the person carries it, but then we are at worst where we are today, at best I could potentially authenticate or add someone from afar.

I'm not saying that smart locks aren't useful, just that they can't only be "smart", which I assume you would agree with since you brought up things currently having backup methods?