Wut? That... does sound very weird but at the same time, why do most people treat microwave power levels like video game review scale (almost never go below 5/1

Wut? That... does sound very weird but at the same time, why do most people treat microwave power levels like video game review scale (almost never go below 5/10). I don't think I've ever read anyone even contemplate using microwave below 50%. What do you cook at 10% power for 20m?