Interesting but not borne out by experience of user wants
It's obviously only limited data but the only IOT things I'm into are LIFX and Hive. HomeKit integration is the #3 most requested feature on hive (after graphs and radiator thermostats) and the #2 most popular topic on LIFX's site after "I can't connect to wifi".
The customers want it. It's just a pain and cost to implement and pulls people into an apple experience instead of a Hive or LIFX one. The gap is still there for a manufacturer to fill. Elgato's Eve is looking like the best option so far but nobody's going to hit mainstream until a hardware manufacturer sorts out the option of physical buttons. Flic etc, do the job but inelegantly; even Apple requires you to use an iDevice.