Why don't you recommend cooking fish in a microwave, which is surely quicker and better for flavour?
Not everyone agrees with your point on flavour; however for very plain cooking a microwave can be good. The problem for the cookery writer is that microwave ovens are not standard and the power levels vary, so it's difficult to give any kind of standard guidelines. The best course if you want to cook fish in the microwave is to follow the instructions in the individual manufacturer's handbook. But the danger with cooking fish in this way is that a few seconds more than it actually needs will render it overcooked and sometimes dry. For this reason, I think cooking fish in a microwave is not as easy for beginners as conventional cooking.