What happens when the wiper sensor malfunctions - now you're scrambling to find the manual controls to shut the damn thing off (if you even can!) Maybe it wipes faster or slower than you prefer. Same thing goes for headlamps.
For every "automatic" system you add to a vehicle, that is just one more thing that can malfunction and I find car repairs to be the most gigantic waste of time and money.
Look, we've proved out the whole "button" concept, and it just works. It's super easy and cheap to replace when it breaks. My car is not a toy, it is a utility. I want the features from the expensive "toy" cars to stay the hell away from my vehicle.