Support for Apple CarPlay would be amazing! 
A CarPlay Dashboard. Imagine that. 
I doubt Apple would approve it. They don't even have HomeKit in CarPlay
Exactly! So far they've ignored/resisted requests to get the Home app into car play. Although some device (garage door openers) do show up.
good point! I completely forgot they would have to approve it first... argghhhh
Not entirely correct, when I get within 100m of my house HomeKit pops up my garage door controls on my screen. It looks like this but in my case says garage door and I can open/close it by tapping on it:
Well Apple have Homekit a little bit in CarPlay.... If you hav e a garageportopener it appears as a button when you arrive at home and then you can push it or tell Siri to open the garage. then when you have exit your home it dissapears.... Quite nice!
haha missed your post...
You two must live in houses made of straw, because you sure are grasping at them! 
I know about the garage door opener. I'd hardly call the availability of one device type as, having HomeKit 