Maybe it depends on the equipment. My stove can heat soup much faster than my microwave. Not to mention in the microwave you have to constantly stir to make sure it’s not still cold in the middle, because a microwave doesn’t heat evenly.

And it makes another pot to clean.

But the warmth in the food heated on a burner is nicer than the warmth generated by the microwave (more even, cools slowly).

Maybe we slow down and expect our lunch to take 10 minutes to heat and 5 minutes to clean up?