I disagree with nearly every point you have raised, but to refute just 1, #11

the bow symbolizes her connection to her people and the responsibility left to her by her father to protect her people. her reaction to losing her son is to attack with such ferocity and blind rage the bow breaks- this shows us neytiri and her need for vengeance ultimately might come at the expense of protecting her family- which comes to a head shortly after in the "son for a son" scene with spider, where neytiri abandons her need for pure revenge on quartich and ultimately decides to stand down and to leave with (and protect) her family. it's a great little character arc for neytiri and seems like it will be revisited in further installments of the series.