Hair dryers normally have 2 controls, one to adjust how much air it blows, and another one to adjust how hot the jet is.

When they're off, they don't blow any air so it would make sense to me to decide that the button to turn them on is the one that controls how much air it blows. It goes from 0 to 1 to turn on, so you just learned that that button changes how much air comes out of it.

But no, most of them do the opposite. So, you turn them on with the temperature control. The action is: no air, yes air, air gets super-hot if you keep pushing the button.

I can't find any modern air dryers where they get this right.