Yeah, funny enough his voice wasn't so high on his earlier work when he was actually a teenager lol. Listen to his verse (2nd) on that song I posted. I think he just kinda indulged in it as part of his style and to make himself standout, sorta like Danny Brown. I think it fits the vibe of his music though personally.
Those Concentration Camp albums are dope. I liked almost everything that label put out. C-Loc, the head of the label, supposedly had some dude murked that was bootlegging Boosie's first album.