She should be a leader to her clan but ask me where's the development?
Neji died yes, he did, but he dies and there's no flashbacks or even some scene that Neji tells her that she should lead her clan, on the war arc.
But no, then 615 comes, she didnt waver she didnt had development she just suddenly "A wild hinata appears and give a speech" Chouji,Ino and Shikamaru had development to give a speech like that but not Hinata how could she understand how Naruto was feelings on that moment if her nindo or better if she wasnt even tested.
She didnt faced any situation like all the other characters that i pointed out demanded.
She just BAM gives a speech and deal with it.
629 was basically this, where's the development for her to become a leader when on the last panel we saw her chasing Naruto on the battlefield chasing him and "healed" his arm.
The problem with her character is just those off panels development that are getting ridiculous, she's becoming what she should be but not with development for sure.
Well i'm not talking about heroine role but still i would comment this, i see Sakura supporting Naruto as a medic ninja and Hinata asspulling all the time which is bothering me, it's not what Sakura is doing but what Hinata is doing without development.
Sakura is the main heroine , her importance lies with the fact of the team 7 which seems to be the whole theme of this manga, resolving Sasuke's situation and the bromance which damaged the story on shippuuden.
Guess aside from Sasuke's asspulling, Hinata is the second biggest troublemaker in this department? It gets very hard to relate to hinata with these constant sudden moments when her role is so limited and yet people try to make it seem like theres much more to it. All there is to Hinata is this:
-Born into a clan of elite people but she was the opposite of it
-Disowned by her father, made a ninja in hopes to improve
-Shy and just flidgets a lot.
-Got her ass kicked by Neji, Naruto kicked his ass for her, this importance towards her just dissapeared as soon as Naruto won (rather the fight had more importance towards Neji, neji was a priority character over Hinata).
-Met Naruto in part 2 but fainted.
-Had a minor role in the Itachi pursuit arc but that arc was for Sasuke and Itachi, her role as the rest of the team seeking Itachi was limited and had no real development.
-Confesses her love and gets steamrolled by pain
-Gets protected by neji, gives a speech, and then thinks about Naruto's hand and fixes a shoulder (not like its just basic chiropractic work yet NH fans say this makes her better than sakura.

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There, literally all of Hinata's notable roles and yet how many other characters have done more? Maybe kishi should take a break from Hinata? I mean the leadership stuff for her, thats acceptable given how the Hyugya operate but thats really all I can see from hinata, her becoming the leader of the Hyugua as Hisashi accepts and having the confidence to do things herself. I mean its not like she can be happy for Naruto in a NS ending, she can simply just be happy for him and move on, she is not the jealous type and her type of character with such a limited role could easily get away with that. Lets say anywhere from 60-100 chapters or so from now, Kishi actually revealed NS as the canon pairing, he could simply have Hinata stand in the background, have a panel focus on her and let her smile and just move on, that would not be an asspull, he could easily do that given Hinata's limited role. Even then other characters would still have more priority over her, not only team 7, also taka, karin is a more important character than her, she has had a more active role. Not to mention how anytime in this simulated future chapter space, we would also get the hokages aid, Hashirama vs Madara, the fate of the kages who faced Madara, heck we even need to see Yamato's fate as well. Simply put, kishi can give Hinata a reasonable ending without NH, he can make NS the canon pairing and give Hinata a good ending development based on her just getting confidence and leadership, nothing else major, she could simply move on from Naruto if she saw him with Sakura. Just its hard to believe this stuff with Hinata as you said, the repeated asspulls make it hard to relate to a character who already has such a limited development and yet has almost no real impact on the story overall.