I don’t think that’s entirely correct. When heating a burrito in the microwave, there’s no source of heat outside the burrito and there’s no heat transfer from outside into the burrito. The heat comes from excited water molecules in the outer layer of the burrito. The burrito itself is the source of heat. But the microwaves only penetrate so far - around 3 centimeters. The inner layers are heated by heat transfer from the outside to the inside which is probably very similar to traditional heating.

This is just being pedantic because your main point stands but I couldn’t help myself…