"So, why does the audience and EVERYONE INVOLVED WITH NARUTO NEED assurance that the couples are in love and planned from the beginning?"
Because they know that it wasn't and that the changed damaged the brand.
The Companies know on some level they kitten up, but apologizing and admitting their mistakes would damage their perceived reputation and upset their investors. So, instead of just going, "Wow, that nH was a mistake few fans like and was mainly liked by pirates. Well, we are fixing it by going back to NS; which our customers actually liked. Sorry for even doing that." They instead hope to 'convince' their customers that nH was always intended will appease them and convince them to continue purchasing Naruto-Boruto products; they just need to keep giving interviews till it happens, in their minds. Problems being that fans have moved on and even if they do believe it may not care.
The ending supporters want people to believe it because they want people to follow what they like. Having so many people disagree with their end pairing upset them. Also if it was always intended then it help defend against the doubt in their mind that maybe Hinata shouldn't have gotten with Naruto.
Edited by Bail o' Lies, 28 February 2021 - 11:03 AM.