My work had a load of commercial microwaves. Always wondered why they had no turntable. But the buttons on the front never made sense to me. Had to poke around

My work had a load of commercial microwaves. Always wondered why they had no turntable. But the buttons on the front never made sense to me. Had to poke around to figure out which one cooked my food in the right amount of time. Not sure if they are all programmable for quick cooking specific foods in restaurants or what.