The microwave has two big related issues (both mentioned in the article).
The first is that it is not easy to make a mental model of how it works. The second is that since it takes little too cook the food, it is unforgiving and you have to be very careful with both timings and amounts.
This makes it hard to learn how to properly use it just by trial and error. Also since now we have inductive stoves there is even less reason to use it.
But on most of them the power setting just changes the percentage of time the magentrotron is 'on', but while it is on, its full power. So something like 'low for 40s' becomes a game of russian roulette
The first is that it is not easy to make a mental model of how it works. The second is that since it takes little too cook the food, it is unforgiving and you have to be very careful with both timings and amounts.
This makes it hard to learn how to properly use it just by trial and error. Also since now we have inductive stoves there is even less reason to use it.