My previous house was smart down to nearly every light being RGB Hue. For movie nights it kicked ass to be able to sync the lights in my living room / kitchen to the movie.
The challenge in IoT is the "I". Many companies make cheap products that REQUIRE internet to work and are not going to work longer than a decade in most cases.
When I was designing that house I had made it a point to not purchase any device that was not Zigbee, Z-Wave or Natively compatible with HomeKit which led to a very robust setup that would continue to function even when the internet was down.
If you are dabbling I recommend making the same decision even if you plan to use GoogleHome or Alexa. The HomeKit compatible things usually cost more for a reason.