I almost feel like there's two generations of smart-home concept at play.
One of them is basically a modern reinvention of X-10. Automation is the selling point-- turn on a outdoor security light at 18:00 and off at 06:00, switch on a water pump when a moisture sensor fires, maybe turn on the indoor lights when the garage door opener starts lifting the door. This feels like a much more solvable problem. It really requires very little "smarts". We could do those things in the 80s with low-voltage signals over CAT3 wires, a bag of 74xx logic gates and jumpers, and some relays. Now, we've replaced the cables with short-range wireless protocols, but there's still very little need for a huge complicated software stack or arguably even a CPU to run the show.
The new generation seems to be about voice control and external services. It takes a bazillion times more infrastructure to capture, decode, and relay "Hey, Siri, turn on the security lights" or accept a message from some remote network relay saying you want to turn the stove off from 300km away, than it does to ask a local battery-backed clock module "Is it 18:00 yet?" And, of course, the reliance on external services tingles my spider-sense for "new revenue models" that involve the tail of user-data sales wagging the dog that is "actually making a product that does what people expect it to without surprises."
I don't think marketing does a good job of decoupling the two. I'd be more interested in a home automation platform that focused on the first option-- simple, bulletproof, and impossible to kill off when they decide they no longer want to support it. But I suspect everyone wants to sell the latter, because for some reason, babbling at your appliances is now modern and sexy rather than a sign of oncoming dementia.
I'm sort of salty because I can't find the one automation device I want. The ceiling fan in my room is on a normal switched mains outlet. I'd love to replace that switch with "on/off/on if it's over (temperature selected on knob)" This seems like it should be a $20 part and a "detach two wires and insert in new switch" install job. All I can find are vendor-specific things that aren't likely to work with my random contractor-grade fan, external boxes clearly designed for plug-in, not hard-wired devices, and systems that are clearly intended to run a whole HVAC system (and obviously won't fit tidly in the little blue wall box)