> I think there is a suggestion of a historical transmission from the late Classic era to the early modern era and it was possibly archery. Not to mention crossbows.
The most obvious reason they practiced volley firing for muskets is the large amount of smoke they produce, once one person shoots the rest can't see where they would fire so you want everyone firing at once so they don't block each other.
So there is no reason to believe the practice evolved from anywhere, they is no world where they didn't volley fire with muskets that produce a lot of smoke since its the obvious thing to do.