Maybe you haven't been around pro players much. Or you haven't noticed the "issues" they have with the rules. I've seen a lot of pro players and I'd be willing to bet that fewer than 1 in 10 of the current crop has ever read the rules. And that's for the standard games, not BB.
Yeah for sure and quite a few times i've seen regular players during a dispute go to a pro for clarification on some semi difficult rule and its probably 70% minimum the pro gets it wrong.