It's a horrible fanfiction nightmare!!
Ok, so NH/SS became canon-- I didn't expect this whole slew of pairing fanservice for an action series to come out after that!
It's like they're rubbing it in our faces or trying to force it on us.
Did FMA make a bunch of sequels about Ed/Winry's child when they became canon? Did Harry/Ginny from HP get a whole movie about their romance when they became official? Even in DBZ, did we get a whole fanservice film about Goku/Chichi and wedding specials about Vegeta/Bulma? This NH/SS fanservice is ridiculous, it's unnatural for a shounen series and something is definitely up. They are doing it for the kittening money and to cover up the real canon couple that was NaruSaku.
Welps thats because they need a LOT of explaining and retconning..actually they NEED to freakin rewrite the whole manga to make their canon pairing believable. Those pairing you mentioned dont need that. They even need to change the characters personality just so it could fit..
It really is something that i or rather we would never be able to comprehend.
I've been saying this alot but really.. they could've make things work on their plan canon pair. Nh and ss could've work well with me if they somehow did it right. i will not be too happy but i could respect it. But not this crappy ending they did.
Actually there are ss and nh fanfictions better than this. Atleast even some fans of those pairs knew how to be realistic somehow. But kishi? Nope. He doesnt seem to respect his characters nor his readers.