Whoever say anything about chinese not using firearms? You need to read the former posts more carefully. Both myself and the one before me, never state anything on Chinese not using firearms.
And as history had it, many of the firearms are actually invented by the Chinese, if they don't use firearms, why in the world they invented it. It is just that the Chinese did not use as much as we would have believe and many of their technology simply stop because the Chinese didn't further improvise in what their ancestors had began.
This had mainly to do with their culture and also in their position being the strongest nation at that time. There simply is no need for firearms (not that much anyway) and because they are already stronger than their opposition.
Traditional weapons were effective against all of Ming's enemies when combined with limited firearm support, they saw no need to improve.
The relationship between bows/crossbows and firearms is like the relationship between Battle Ships and Carriers, one does not see the need to change to the later unless under certain stress.
From what I can see, the Chinese emphasis alot in battle formation, tactics and strategies, but not so much in actual military technology developement.
I've always felt dissatisfied by such explanations. Medieval China lost as many battles as it won. In no way did it consistently hold a definitive advantage over its enemies. Obviously then, its military technology was NOT enough, and had plenty of room for improvement.