My lights adjust their brightness and color spectrum automatically throughout the day while also understanding the time of year and sun position. This alone is next level. All are voice/tablet controlled. When I start a movie at night, lights will adjust automatically in my open floor plan first level. All of this operates without me ever having to give any mental energy beyond the initial setup.

This is not just flip a switch territory.

Many homes have a bunch of lights with their own switches, like lamps. Also there are rooms with multiple entrances, like a living room with a bedroom on the other side from the from the front door entrance, which would involve walking to the side of the room with the switch then walking back through a dark room after you turn it off. Being able to just get into bed and say "Alexa, turn off all of the lights" is way more convenient than checking 14 light switches around my home.

Yes, that would be a button within arms reach, something I explicitly prefer over the voice assistant. I use them frequently.

I don't have just one light per room though, some spaces like my workshop or living room have a lot of lighting options, and flitting around the room flipping a bunch of switches is clumsy and unnecessary. The preference is always towards automation (e.g. when I play a movie in Jellyfin, the lights dim) but there are situations where I just need to ask for the workbench light.

The Sun moves around, while I am in a room. It might be high up when I enter a room, but after a while there may be clouds or it may have set.

When watching a movie one may dimthe light. Once finished one may need more lights.

When going to bed I may want to switch all lights off. When getting up it may need some extra light.

A switch on the door is nice. More switches is better. Being able to control from anywhere may be even nicer.