Gameplay would be more dull without them.
I’m not denying Abe uses his mental powers at least much more than regular Mudokons, just saying that it compromises the message and appeal of his character to my mind. Then again, Abe may be the only Mud we’ve seen who can possess other characters, but we’ve never seen him teleport himself without a bird portal, regrow a tree from a stump, or initiate a storm, all of which we’ve seen performed by other Mudokons. Even his ability to transform into the Shrykull comes from his hand scars, which he earned by being nimble, solving puzzles, and understanding the behaviour of the sacred creatures, and is only an option for him at sporadic points.