> If all of your main force is expected to wield it, it becomes a primary weapon.

There was a period of time when all Englishmen were required to train with a longbow.

I guess also it depends on what you mean by "primary" if it means the primary weapon of an individual soldier, it's obviously false, because archers primarily used their bows, in many armies. But if it means the main weapon used by the builk of the soldiers, then in most cases it probably wasn't a bow. But that isn't because of the ineffectiveness of the weapon. It's really just part of the "egalitarian" point. Shooting a bow effectively requires considerably more skill than say using spear, or even hacking with a sword.