NaruSaku wouldn't need any justification. Unlike NaruHina and SasuSaku, it had mutual development. Sakura's feelings for Sasuke were questioned by canonical sources, and if she were afforded the sanity, self-respect and dignity of a normal person, she would have moved on. More to the point her "budding" feelings for Naruto were already hinted at on numerous occasions before they were swept under the rug. All this pairing would have needed was for to Kishimoto to finish what he started with Naruto's self-imposed rule on fulfilling his promise before he could confess to her.
That's beside the point though, because this isn't about NaruSaku, it's about the questionable writing in The Last that you are defending purely because it validates a relationship we both know had no mutual basis in the actual manga and would not have come to fruition if it weren't popular, because if it was meant to happen, then you wouldn't need a movie relying on retcons to establish a love story that was nearly nonexistent and entirely one-sided in the actual manga. But of course you would rather deflect criticism than address it.
Naruto never had as many interactions with Hinata then compared to Sakura, I agree but other then Sakura always crying while Naruto was confronting her did we ever see Sakura confronting Naruto and by doing so saving him from a point of distraught like how Hinata did?
If I recall the closet thing was Sakura saying she will be there with him in order to get Sasuke back.... which really isn't addressing Naruto's personal struggles and beliefs rather then just encouraging him to help complete his promise.
If you look at all the times Naruto seriously interacts with Hinata in a serious situation either one of them is helped mentally in a time of need
Screw the whole Hinata stepping in to save Naruto when Pain had him pinned down.... Naruto b
asically knew what Hinata was feeling when he saved her back in that War Arc scene with the Zetsus
And when Naruto was mentally in the slumps Hinata was the one who saved him and knew what he was thinking in his time of need....
Of course you have those laughing/smiling scenes with Naruto and Sakura but they are in the same bloody team and hence speak/interact with each other every day....
Oh but Sakura did save Naruto with that CPR.... great they would've lost the war without him
From him considering Hinata as some weirdo to mentally knowing when she is down or in danger just shows how much progress they had
Hinata was a shy/pessimistic girl who had her Father looking down on her... I wouldn't be shocked if she tried to confront Naruto but Naruto pushed her away.....
Kishi focused most of part 2 on Team 7 trying to save Sasuke.... being a battle shonen series + feeling embarrassed when trying to create romance scenarios I am not shocked that this movie is trying to address his short comings
but saying this isn't Naruto or that Kishi was pressured in following this route by Editors/Fans when he chose his protag to be with a girl that
he created compared to another girl that the editors actually forced on him is a load of bull