Most rooms in my house each have at least a handful of different, indirect lighting solutions. I could pay an electrician to wire them all to a single mains switch, but then I would need them to come back whenever I want it changing. It would also be more complicated to have dimmers and set programs for different times of the day to to adjust the lighting to a number of presets.

I could just have the one or two overhead lights that these rooms came with, but that's just an unpleasant to look at experience to my eyes all of the overhead lights got replaced with ceiling fans that have no lighting that come on when the room is occupied and over a certain temp.

You walk in the room, a bunch of lights and may be a fan come on at the right lighting for that time of the day, then they go off at a suitable period of time. I even have all my garden lighting coming on via motion despite some of it being a separate 12v system that's battery and solar powered via a 12v zigabee multi channel relay.