I think it's safe to assume that no director on any site is going to have people complain by remaining completely out of the scene during the sex. I don't think I have ever heard a single complaint of "This scene was ok, but it would have been better if [insert director's name] would have interrupted the sex more." If a scene is going so bad that the guys don't know what to do next or are fumbling around trying to figure it out (or get hard), the scene needs to be ditched and reshot from scratch anyway.
Fortunately this scene was excellent, and the interruptions were just a minor annoyance in my opinion. We all make mistakes, none of us is perfect, and hopefully it won't happen again on a regular basis.
Abe