HolyJoker
The skill of the player is not impossible to reproduce in hxh. But you left it very broken. The conditions are very weak, as the user is a sociopath and psychopath. Therefore, killing Nen users to get the experience is not really a sacrifice for him, and to get a Hatsu as broken as his is simply not acceptable. It is basically making fun of all the other characters who were born naturally talented, yet still failed to reach the heights of the MC.