well that's how art works Meth people can't change their flows like that

when you get in the studio or actually study music then talk voice is not something that turns like that voice needs to be trained it's HARD work behind it plus if he never changes his musical style he will never change musical emotions so he will never change his flow and rappers are not singers to change their voices on every album MC's don't jump on other genres

It depends a lot on the beats too, even Tupac switched up his flow. You can't rap Dear Mama on Keep Ya Head Up or vice versa. I feel that you need to touch some topics though, which Pac did a lot.

Word.