I was driving a friend's newer car down the freeway once, and had to call him to find out how to turn on the godam defroster. There were so many knobs, switches, and dials that influence this, all labelled with icons so I had no idea what they did. Turns out that you had to push two buttons, toggle a toggle, and turn two knobs. Madness.

My car has a selector that you move to "defrost". Then it defrosts, like magic.

It's nice, but it still a major issue: you need to look at it while pressing it to know state.

If, instead, it's three stacked buttons top to bottom, you don't have to do that.