Listen to any radio single for a rock group. Like Aerosmith. Listen to Joe Perry play 5 chords over and over on I Don't Wanna Miss a Thing, Angel, or the radio promos for something off Get a Grip. No solo, hardly any breaks or fill ins, just some straight guitar work. You couldn't judge him off that.
Plus, you're talking about hip hop. They'll take one chord and loop it through the whole song. You think they can't hire great studio musicians to light it up on their albums? Of course they can, but it's not necessary nor is it a good idea, because popular music relies on simple hooks.