Maybe not. If he is past the loan stage of his life and moved on to pile of undeployed capital, he may be correct that credit rating doesn't matter to him. He may lose some opportunity cost (like zero percent interest on a vehicle and instead has to pay cash) but that may not affect him much.If you don't care about it now, trust me, there will be some point in the future you wish you had.
I finally got a 900. I didn't know if it was possible. Wobbling around just below for a while. It was more just a game to see if it was possible. My in-laws don't borrow so their credit scores are much lower as there is nothing to track. Since they don't borrow, don't sign up for new credit cards, etc, the score is interesting to know but means nothing in their lives.