Studies have shown that during the time Hinata was dancing at the waterfall, the dance creates special nutrients into the water. In addition, it is because of these special nutrients, that the plants are able to survive. NarutoxHinata is important since the only reason Hinata danced under the waterfall is because she thought of protecting Naruto kun. The desire of protecting her love has caused her to dance, because dancing under the waterfall can protect people.