Well Anime has always done in justice, just look at Bikochu beetle arc in Part 1, Hinata developed a new technique " Protection of the Eight Trigrams Sixty-Four Palms" thanks to her training, she managed to defeat and strike down every enemies all by herself, it made hinata such a badass female character, it even made Naruto concern for Hinata, but after seeing what Hinata could do, He praises her and this feel a strong buildup for proper development between the two.
Some fillers gives side characters developments that didn't recieve much screen time more, or gives more in canon filler fight which was executed better than in the manga. For example Pain vs Hinata was portrayed alot better than in the manga due to amound of intensity, sorrowful, with providing more indepth backstory as a childhood and Hinata going all out like a true brave kunoichi, the fight was definately prolonged and much more entertain. Hinata atleast shows that she's manage to break some rods but Unlike the Anime, we've only seen Hinata against pain in 2 panels and that's that which is so lame.
I seriously thought Hinata was such a great character only then to come found out that this is only fillers, and I was so pissed cause I thought this was canon and then I come to realize that Kishi tends to not only downplay Hinata, but also most of the female character.
