Proper door design makes a huge difference when a lot of people unfamiliar with said door need to use it in a short period of time and the cost of a delay can b

Proper door design makes a huge difference when a lot of people unfamiliar with said door need to use it in a short period of time and the cost of a delay can be congestion or even injury. Evacuation scenarios, rush hour traffic, black friday sales, that sort of thing. It doesn't make a huge difference to doors only a few people use a couple of times a day. That said, door design is a good example for many other things. To give you a particular one, a certain DVD player/recorder made by Panasonic has two large buttons on the upper corners of its front panel. One is the on/standby button and the other is the eject button. They placed the on/off button right next to the DVD tray, and literally everyone who has attempted to place a DVD in it has accidentally turned it off instead. Given it takes 20+ seconds to power cycle, this is extemely annoying, but of course not painful enough to ditch the whole thing as it otherwise works fine. You don't get used to it either, it's a jarring experience every time. Given neither switch is actually on the PCB and both are wired in, it would have been trivial to flip them around (and one of these days I will do so), but the designers didn't think of it.