To clarify my perspective, I don't think of HxH is a deconstruction at all. I do think Togashi does take conventions and plays with them. Arcs don't typically end with a fight with a big bad, for example, the YorkNew city arc, which ends not by beating the Troupe but a standstill because players in both groups of characters are protecting people they care about, or how the Ant arc ends and progress, or Gon's character. Even in the examples that you pointed that follow conventions, I think are done well. Gon and Killua never really become much stronger than every around them. In the Chimera Ant arc, they were still outclassed tremendously, Gon has to commit a taboo just to survive at the end and pays for it after, Kurapika screws himself over to just defeat one group etc. There are consequences to huge increases in power, it never reaches Naruto levels, where he suddenly becomes as strong as all these other Ninja.
For me just adding a consequence doesn't change anything. Just like is mega simple to do a huge power up is also easy to create a consequence for it. The consequences started with Kurapika because it is totally unthinkable that a person of his caliber could suddenly jump dozens if not hundreds of levels(I'm using level as a really loosely word here).
The out of the norm, just really seems a desire, it also doesn't adds nothing to the story in fact sometimes even does quite the opposite, it damages it. And this desire his one that comes from Togashi since Yu Yu Hakusho and some of it comes from not knowing what to do anymore. Like he change the character of Urameshi because he didn't had anything more to write about the characters, though his story was really short and he spent half or more than half in a repetitive tournament. He wanted to change Urameshi 180º, fortunately was stopped, but he still changed him. For me to worse, that was one of the reasons that Chapter Black arc wasn't my favorite arc of the series.
In HunterxHunter is the same thing, this desire of going out of the norm just for the lols and when he goes into a corner. It makes many of the arcs loose their power. Strangely enough though Greed Island is one of the arcs with the weakest endings and ended quite regularly.
I don't think he takes conventions and plays with them. At least not in grand part. So I don't really see what people see so exotic of HxH, people also think YYH is exotic and I also don't see what.
I think that for majority of the story it follows conventions and is not that I think that they are badly made, but they are quite obvious to me. If it wasn't for all the different and deep and deconstruction or things like that I wouldn't even bother with saying or even thinking much about how much it follows old conventions and is really based on them, but the yelling really brings that always to the memory when thinking about HxH and hearing people saying something in those terms. Is like a curse :P.
Gon and Killua had no business in getting the level of Nen they are in. Though after just two arcs it seems is easy for anybody to get Nen and to the levels they got(And Kurapika, is even worse than them. If they are genius of one in a Million, than Kurapika is 1 in a world life). The Chimera easily got it, with the excuse of Instincts, than it was invented the fast way of beating someone and if he survives he gets it too, to make the old without Nen chimeras to also get it. Then that was also true for humans, and now the princes are also going to learn Nen in a usable level super fast, and it seems by regular learning, at least the serial killer one.
I would call the Spiders just one group. The way they appeared they were stronger than mega strong Nen users, I don't remember what was the title given to the guys from the Mafia, but they were supposedly mega strong, and just one guy from the Spider kicks their asses like it is nothing. And then Kurapika comes and shits on him, like he is nothing.
In fact I would say Naruto is better in increasing the levels of power, not to say Naruto is good, but there was never a boost like Kurapika, nor one like Adult Gon and not one like Gon and Kurapika learning Nen. The explanation of Naruto fast increase in power though somewhat stupid wasn't has bad as HxH. HxH doesn't have good increases of power, what it has is an addition of a consequence. That is also as ridiculous as the increase in power. In fact I would like to know who is the person that teached Kurapika about the consequence game, his Nen master? It was never shown, and if it was him why does he know that and why does he told him? And how did Gon became aware of the consequence game? Did it really happened by "instinct" without him noticing. Why are them the only ones doing it, why only the main characters? Netero had such a restriction didn't he? Or does it work in a specific way that not included him placing a bom in his heart where he would explode it if he failed his mission? Why didn't he gained such a huge increase of power?