Personally, the vast majority of my smart home stuff is light automation. It's nice having a selection of lights automatically turn on half an hour before sunset, and it's nice having a button next to my bed that either turns on the reading lamps, or turns off all the lights in the house depending on how long I press it.

Though in fairness, I am drifting back towards having my lights controlled by buttons, because voice control is mostly bollocks. But now the lights font have to be the ones wired in to the house. It can be any that I can add to Home Assistant.