What is hax in front of overwhelming power? Like boa is an insect to BM despite having better hax. Hisoka is an insect to youpi. Even with bungee added , his power and debatably speed are below youpi's.
And what can hisoka do to killua? Killua will shred hisoka to pieces.
You’re comparing two completely different series, who have completely different methods of handling combat and hax, and pretending their methods are the same. You can’t do that in powerscaling, especially when said series has combat as variable as Hunter x Hunter. BM can resist Boa’s hax because of her Haki, or completely ignore Boa’s Devil Fruit because of every other aspect of herself. In One Piece, if you’re strong enough you can completely ignore an opponent’s hax arsenal.
This doesn’t work in Hunter x Hunter. In a nutshell,
NEN IS VARIABLE! If you underestimate the enemy, or incorrectly analyze the enemy’s movement or their ability, you could be
DEAD! If an ability’s Conditions are fulfilled, there’s no such thing as resisting with physical strength or aura reserves. Ging can’t act like a goofball 24/7 around Nen users like Camilla, Baise or Shalnark and Illumi. Because Baise could kiss Ging to turn him into a slave, Shalnark or Illumi shoot him with a needle to turn him into a slave, and Camilla could kill him if he kills her.
Am I saying they stand a chance against Ging in other aspects of Nen battle? Absolutely not. However that small chance, along with the hax side of Nen, are why Nen masters are encouraged to work smarter, not harder. Instead of brute forcing their way through everything, they have to fight different types of enemies and brainstorm different strategies. They have to be patient, analyze, use Gyo on the eyes etc… Morel said there are multiple options to use against someone who relies on speed. That’s all Whirlwind is. All speed, and Killua has power but not enough to kill Hisoka. Like I said before Killua is physically inferior to Knuckle, who’s probably physically inferior to Hisoka. Even if Hisoka can’t outspeed Whirlwind, he can outsmart the user.
We’ve been seeing throughout the Succession War the danger of esoteric, Condition-heavy abilities. Masters like Hisoka and the Phantom Troupe are very experienced in dealing with these kind of abilities, so why would Whirlwind be such a roadblock?
Unless you’re someone as smart and experienced as Bisky or Zeno - Nen masters capable of
immediately realizing an enemy doesn’t have a very hax ability - you’re better off being on-guard for weird abilities. And even then, Bisky and Zeno weren’t acting like idiots with their enemies. Not even Hisoka would be brute forcing his way through Whirlwind.