IMO? Nothing. I do have some WeMo switches on some lamps in our living room. I got them instead of fiddly-dip-switch timers before a vacation several years ago

IMO? Nothing. I do have some WeMo switches on some lamps in our living room. I got them instead of fiddly-dip-switch timers before a vacation several years ago, and it turns out I like having them come on an X time automatically, and turn off at 10, when we typically go to bed. We never interact with them; it's great. But the thermostat is dumb (but programmable). The locks are all regular locks. We have no smart speaker (dear god WHY?). The TV is dumb. Why? Because I've spent 30 years in software, and my watchword is "don't put firmware in shit that doesn't fucking need firmware."