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Early microwaves didn't heat so evenly, to the point where food prep directions suggested they give their food a quarter turn halfway through cooking it.
Most frozen food doesn't heat evenly anyway -- where it thaws first cooks faster, because water heats faster than ice in a microwave. Thus people came to believe that all microwaves heated unevenly, and all would benefit from turntable.
Correctly designed non-M.B.A.-driven microwaves can cook without the turntable. Utterly cheap ones, though, may cook better by moving the food during cooking. What is really needed, though, is some sort of orbital thing like the sanders and waxers. I've cooked foods on a turntable where the food was heated in a circular pattern. An orbital pattern would solve that. Innovators and patriots take note.
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