I think the course would be just as great without deep rough. It would be more fun for the best in the world, as they could then try heroic shots from weird, wayward angles. And, it would be more fun for us amateurs to watch them try those shots. It would obviously be more fun while still being more than sufficiently challenging for all of us non-professionals.
One height of cut, through the green, except for greens, and ditch hazards.....that would really get their attention.