It is a specialized trade. One of many. I would say that fighting in and of itself is also a specialized trade.

[It certainly goes against her upbringing and her parents' teachings. They had only taught her medicine and to some degree, a poisoner's art. They had instilled the understanding that many substances can be used to both heal and harm others, depending on how a doctor or pharmacist handled them. It was Yaone herself that had taught herself how to make gunpowder after researching 'fire medicine' during the course of her studies.]

In many ways, the art of combat has been far more difficult to master.