It has to do with keeping the internal circuit boards cool so they don’t overheat due to the heat from the oven. We had a stove that did that too. I hated that thing. It would roar like a jet engine for about 30 minutes even after you turned the oven off.
This is the correct answer. All of the other explanations are dancing around this: no matter what YOU think of a particular product, if a customer is willing to buy it then YOUR opinion must be the wrong one.