Yes, I think you're right, turning down the power level is usually implemented as cycling the magnetron. But you need to be smart in how you do it if you're no

Yes, I think you're right, turning down the power level is usually implemented as cycling the magnetron. But you need to be smart in how you do it if you're not going to wear out the microwave unnecessarily by using cycles that are too short. If you are cooking something big you can do 50% with 30s on / 30s off, while if it's small you might need 2s on / 2s off. Hence the relatively complex controls.