I have been working in this area (LLMs for ubiquitous computing, more generally) for my PhD dissertation and have discovered some interesting quality issues when you dig deeper [0]. If you only have lights in your house, for instance, the GPT models will always use them in response to just about any command you give, then post-rationalize the answer. If I say "it's too chilly in here" in a house with only lights, it will turn them on as a way of "warming things up". Kind of like a smart home form of hallucination. I think these sorts of quality issues will be the big hurdle to product integration.