But it’s not an open standard, and all of the 3rd party home kit apps are basically a new client for services that Apple develops.

I say this as someone who sticks with HomeKit because I think it’s one of the better IOT solutions if you care about for privacy and security. My home is all HomeKit compatible. Lutron, Eve, and homebridge for odds and ends.

But I’m fully aware that, if Apple decided to pull the plug, I’d probably be running some sort of local home brewed HomeKit clone on a raspberry pi to keep the network alive.