My objection to stuff on the steering wheel is that in my experience the buttons are often multifunction. I.e. a "+" and "-" button that do different things depending on a mode that is selected with some other button. Takes too much thinking while your attention should be devoted to driving.

My Mercedes is absolutely terrible at this. Having owned it for a couple of years now I still have no intuition about what most of the steering wheel buttons do. On the other hand, they get cruise control right: It's a simple stalk on the steering column. Up for faster. Down for slower. Easy to find and operate without even a glance off of the road.

If there were a few carefully chosen single-purpose buttons on the steering wheel I could maybe get on board. But if there are too many or they are multifunction then it's cognitive overload.