I think it’s a neat idea, but you need hard boundaries around the “spontaneity” layer. The core of the house—lights, HVAC, coffee maker—should run on a deterministic schedule that’s driven by data: your wake‑up time, weather, and energy pricing. Then you can inject random elements as optional triggers: a light flicker that starts the next song, or a scent that’s released on a random hour. The key is that each random event has a clear exit strategy so you don’t end up with a coffee machine that starts brewing at 3 am because the system thought it was “creative.” In practice, use a modular architecture: a baseline routine engine, an optional “surprise” module that pulls from a pre‑approved list of safe actions, and a monitoring layer that logs every unexpected change. That way you keep the efficiency intact while giving the user that small dose of unpredictability they’re craving.