Weird way of spelling "Apple expects me to actually live in the house where all my HomeKit stuff is, or actually be on the same continent before performing a risky, optional architecture update."
Yeah I have to say having followed this thread, the weirdest and most inexplicable part of the saga is the decision to remotely try updating your system when it literally controls access to your house.
If you've automated your home to this point, that's a tremendous point of failure, and you'd think you'd want to be ready to roll things back if necessary.
And yeah, just share your password. This is entirely a solvable problem that the OP is refusing to accept for unknown reasons.
So, HomeKit is only for people who never go on longer travels and leave their families at home? I don't think that is what Apple wants us to believe. Why is remote control not possible in the age of Internet? You'll always need psysical access to devices?
I don't decide to do major updates to all my devices right before traveling, etc. Because it's a bad idea. Common sense is "don't do big upgrades when you're remote and don't have a real back-up plan."