Earlier quoted context omitted.
I mean...I guess arrows are reusable and much more easily created by hand than bullets? I guess?
They are an a lot quieter. But don't be fooled. Even with shitty long guns (not even riffles since they weren't riffled), the American Indians swapped bows for guns. They still used bows, but took to guns due to their power.
Even Kentucky long rifles which were very effective against infantry were pretty much worthless against mounted natives who could fire dozens of arrows a minute.
This was the case up until about the 1850s.