You can't have ideas without personalities.
Well, you could, but that would presuppose everybody being mature enough to dispense with their egos, in order to more clearly present their ideas.
And if you're going to presuppose something, it would be more realistic to presuppose people aren't mature enough, in general, to do that.
So you're stuck with the personalities.
BTW, what does 'metal' have to do with nihilism?
Is there a connection, or is this all some random happening?
I'm still trying to figure out what nihilism is.
'Metal' too, for that matter.