I don’t know if I can count this as mine, but I certainly didn’t disagree with predictions of others around 1990 or so that the smart home would be the future. The idea was that you’d have a central home computer and it would interface with all sorts of other systems and basically control the house.

While there are various systems for home automation, things like Home Assistant or OpenHAB, and some people use them, and I’ve used some technology that were expected to be part of this myself, like X10 for device control over power circuits, the vision of a heavily-automated, centrally-controlled home never made it to become the normal. I think that the most-widely-deployed piece of home automation that has shown up since then is maybe the smart thermostat, which isn’t generally hooked into some central home computer.