The point has already been made in this post several times.
In any case I wasn't referring to CR, but the point has been made. Even my IRL buddy who's been playing tabletop (pathfinder currently) for years has this rule. He told me stories going back 10 years I've known him (before CR) about nay 1 and nay 20 hijinks.
He never told me it was a house rule. I always thought nat 1 was auto fail every time.