Another thing I hate: user interfaces in which the visual/audible feedback is independent of whether the input has taken effect. This is distressingly common. E

Another thing I hate: user interfaces in which the visual/audible feedback is independent of whether the input has taken effect. This is distressingly common. Even self-checkout tills in supermarkets do this. For example, you touch a button on the screen, and it changes colour briefly, seemingly to indicate that the button press has been registered, but then nothing happens and you have to press the button again to get your receipt printed or whatever. This is the more common case, but sometimes with the same device you also have the button press taking effect without the visual feedback. I think I observed full independence of feedback and effect with a physical button on a microwave oven: when you attempted to press the button you sometimes got a beep, and the time sometimes got incremented by 10 s, or perhaps 20 s, and sometimes you'd get both those things, and sometimes you'd get just one of them. It must take real skill to design an appliance with a physical button that "works" like that, but some genius engineer managed to do it. I hope that person never gets a job in the car industry.