I do like that Kite ultimately reincarnates in the end and so Gon’s sacrifice and nen contract was ultimately for nothing. Gon throws away his entire potential and couldn’t control any of his emotions which makes him feels so much like a real person rather than some destined superhero of the world. Gon couldn’t forgive himself and because of that he essentially quits being a hunter (since being a hunter means having some sort of mastery of nen) so it’s a comeuppance for the audience feeling that Gon is speeding through everything and not actually maturing (because you can argue he never matured because you can’t in just 2 short years).

I love the idea that Gon just becomes a kid in the end and lives with his adoptive mother which I think is a valuable message (also Killua spending his life with his trans younger sister and protecting her). That even at the end of the anime Gon is so far removed from people like Hisoka or his dad who “inhabit different worlds”