As someone who earns his money in industrial automation it amazes me how limited these home automation firms think. They want me to buy multiple sensors each with only one I/O point on them??? They want me to buy plastic toy-like stuff that breaks if you push the contact a few thousand times? And then there is the matter of future-proofing: in 5 years time nobody will be able to read the sensors anymore that you bought because "everybody" is on the new standard. What about spare parts for existing stuff, are they expecting me to rewire the house each time they come up with a new platform? Not a chance.
Then there is software: Windows XP, maybe with .net, was a valid choice for building the interface when the company designed it a few years ago but I expect my light switch to last at least 25 years.
These days you can run an oil refinery with a touch of a button and keep it running for 20 years with available spare parts. And you can get data in & out of that system in any format you want. Show me the same on a scaled down version for my home and I'll start installing it...