While it is true that the Na'vi may not need a lot of technological advances like for example, aeroplanes or ships because they have nature on that side. And it's that very nature that they do not want to upset by cutting down trees and building bigger and bigger colonies.

However, the threat of the humans are very present. And this blogger really just hit me and intrigued me.

With the threat of the humans being so real, and with their intelligence, I don't see why they should just rely on bows and arrows while they can actually build fire cannons etc.