Personally I think problems people have with appliances like microwave ovens are a combination of fear and intellectual laziness (aka. not expecting to have to figure out anything for themselves anymore). Probably the same thing as with computers in general[0].
Most of appliances provide functions expected from devices of their class and follow obvious patterns that you quickly internalize. I have a running bet with my friends that I can operate any electronic appliance without a manual. The hardest case I've ever had so far was setting the clock on a microwave that provided alternative functionality under "START" button when the oven doors were open. It took me a few minutes to crack that one.
Most of appliances provide functions expected from devices of their class and follow obvious patterns that you quickly internalize. I have a running bet with my friends that I can operate any electronic appliance without a manual. The hardest case I've ever had so far was setting the clock on a microwave that provided alternative functionality under "START" button when the oven doors were open. It took me a few minutes to crack that one.
[0] - https://xkcd.com/627/