Convenience and fun. It’s not about having buttons to push, it’s about making sure things are taken care of.
The house closes the garage and turns off the lights when I leave. The hallway dimly lights up when I get up at night to use the bathroom. When the dishwasher runs, it keeps track of how much soap is used and adds it to my grocery list when it gets low. If the dog walker comes to the front door, it unlocks for them. My interior lights can be cool white during the day and warm white at night without me doing anything. Soil moisture sensors let the system auto-water my vegetables, as well as my lawn, and at the exact time of day when it’ll be the coolest.
I don’t necessarily need any of that, but it sure makes things easier.