Not exactly what you're looking for, but I have the less immersive version of a smart home (google home and a few other wifi appliances), its completely useless and is a gimmick. its nice and is a cool party trick to change the color of the lights on your phone or yell at a device to play music but that's about it. if you have people over you can buy a google home mini for $50 and thats it
i'm willing to bet you wont change the temperature of the thermostat often, smart locks are kinda a gimmick too if you know how to use keys etc, though if you're getting a security system installed with cameras and whatnot it might be useful.
i'll put it this way - if and when i have my own house, i probably would go and do it because i find messing with electronics fun and not necessarily because it's an actually useful thing.