It's a pity Google acquired Nest. If not, it probably would have supported both Apple and Google's control solution.

HomeKit is mostly just an addressing system allowing the house to be described in config. It's not a huge loss for consumers if both Apple and Google have their own flavours of this.

Provided the product companies producing hardware remain independent rather than being swallowed up by Apple or Google.

I'd be equally annoyed if Apple started acquiring companies like Withings.