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Very annoying - my son uses HK on an older 8-plus. Works flawlessly.

Thanks Tim for taking it from him! No we aren’t getting him a new phone anytime soon!
 
Just maybe, there aren't any Homekit connected smoke detectors because they have to be 100% reliable.
I have no doubt but that liability and lawyers are somehow part of the reason, but actual reliability of smoke/CO detectors wouldn't be dependent on whether HomeKit is functioning properly or not. It's no different than a smart lightswitch. You can still operate the switch manually even if the your wifi is all the way down. A smoke detector will still detect smoke and set off its alarm even if your HomeKit gear is on the fritz.
 
I have old iPad Pro that iOS can't be updated anymore. I have it around to do simple stuff. Like control various devices. I guess with this transition, I assume it will no longer work. Unless this upgrade is all on Apple server side.
 
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