I'd guess that each button equates to a feature. So nobody wants to be seen "removing features" from the product. Microwave A: - heats food for the duration y

I'd guess that each button equates to a feature. So nobody wants to be seen "removing features" from the product. Microwave A: - heats food for the duration you want and power level you want Microwave B: - heats food for the duration you want and power level you want - thaws food - warms pizza - makes popcorn - boils water in a cup - etc.