People aren't dismissing it because they don't have it, they're dismissing it because the UX is terrible, it's too high maintenance, and the future of any individual solution uncertain.

In some ways it's like pre-iPhone mobile apps. They absolutely did exist, but were mostly too much hassle until they could be seamlessly downloaded from the App Store, sandboxed, and held to quality standards. We're still in the Symbian era of home automation.

(My wife worked at a home automation / security company about a decade ago. It had basically all the same problems back then too, but for a couple of years I had an internet-connected doorbell)