Because a regular microwave can't do what was described in the comment you're replying to? A microwave just heats everything - maybe irregularly, but not intent

Because a regular microwave can't do what was described in the comment you're replying to? A microwave just heats everything - maybe irregularly, but not intentionally irregularly > By regulating the oven’s heat in one place, you can cook the fish while the ice stays frozen. Another such example is making cooked and raw salmon at the same time, by focusing the oven’s action at specific areas of the salmon