We're talking about song making right. That includes writing verses and how you rap your verse (flows, pockets, etc). It also includes, to quote Murphy Lee lol, what the hook gonna be. The hook is presumably going to relate to the verses in some way thematically. My entire point is that whether the rapper does the hook himself or not, this is a song making process that the artist deserves credit for. It's his song. What is best for the song? The rappers who constantly make the best decision when it comes to that have the best hooks to me.
Also if we're gonna haggle over this, why don't you also do the same based on who wrote the hook and whether it's an interpolation? Does Nas get docked points because Street Dreams' hook is an interpolation of Sweet Dreams? Does he get knocked points because Gimme Yours is from an I-Level song?
If you're gonna argue rappers shouldn't receive credit for hooks they didn't come up, why should they get credit for hooks they recited from another record lol? I feel like that's a contradiction with your argument whereas with me it doesn't matter: I just care about what's best for the song. If that's Nas singing a hook himself, that he got from another song, so be it. And if it's Nas getting Mary J to do the same hook, there is no difference in my mind. Speaking of Mary J, she had quite a few hooks that were "taken" from other songs. Can't Knock The Hustle for instance. Nobody would dock Mary J for that either.