@PotatoZero
Yes, otherwise, the warrior class will rule society. This is probably already the setting of this fantasy world.
Guns allow a peasant, with only a week of training, to defeat a warrior who has trained his entire life. Also, wizards tend to be very *well-studied*. Assuming this is the a typical pseudo-medieval fantasy world, a peasant who worries about his crops and maybe if he even has food to eat tomorrow has no time to read grimoires (or even learn how to read). One could argue that crossbows were a thing too, but contemporary armor usually were enough to defeat bolts and arrows. Spears might have been easy to use too, but only in numbers, tight formations, and discipline that they could be used by peasants to defeat knights. So if guns were to be introduced into this world, adventurer warriors and mages would lose their jobs as was hinted in this chapter, and revolutions will happen when peasant revolts are armed with shot and gunpowder.
But you do have a point there. Towns and villages are already protected by adventurers and knights. There's no need to change the status quo. MC - after breaking a tool that was what defined his worth in the party - was a bit anxious and felt that he wanted to do more by directly contributing to the battles.