Pretty sure everyone knows that the power setting on the microwave just changes the duty cycle of the magnetron. I've never seen a microwave specify wattage when selecting power, usually 1-10 or 1-100, no lies involved. What it does is allows the heat more time to evenly distribute through your food while cooking with the same amount of energy. That super hot bowl and tepid soup won't have as much of a difference when it takes twice as long to cook. Hot spots don't get a chance to get as hot. Psychologically it's easier too because let's be honest, no one's waiting 5 minutes after that timer goes off for the heat to settle