Simplicity takes effort— genius, even. The average programmer seems to produce UI designs that are almost willfully bad. I was trying to use the stove at my mother’s house a couple weeks ago. It was a new one, and instead of physical knobs it had buttons and an LED display. I tried pressing some buttons I thought would cause it to get hot, and you know what it said? “Err.” Not even “Error.” “Err.” You can’t just say “Err” to the user of a stove. You should design the UI so that errors are impossible. And the boneheads who designed this stove even had an example of such a UI to work from: the old one. You turn one knob to set the temperature and another to set the timer. What was wrong with that? It just worked.
Another Paul Graham essay worth reading.