Friendship beats all: This has never occurred in HxH.
:Deus Ex Machina powers (Gon)Not a deus ex machina, completely reasonable under the rules of Nen:Deus Ex Machina powers x2 (Alluka)BIGGER AND BADDER FOES!Okay, but only due to the Killua rule.
Protagonists get stronger and learn faster than anyone (tournament arc looking at you, boy)
It's very basic when you actually examine the material. It goes through the motions but there's nothing about it that actually screams originality.
It doesn't have to completely reinvent the wheel. People already like "the shonen formula" and HxH tweaks it in just the right ways to make it satisfying.