In truth, we're a bit frightened about this one. Several times in pub/coffee shop/cider drinking in the park conversations, we've chatted about film directors who perhaps have got too powerful, that they seem to be able to get their own way without having someone to call bullshit on them - be it a good boss, or a very good friend that they trust and listen to.
This can be a very good thing. After all, we want film directors to be free to tell their stories. We don't want studio suits calling the shots. And some directors use their independence wondefully well, without losing what bought it to them in the first place (so, Steven Spielberg, Martin Scorsese, Christopher Nolan, Robert Zemeckis and such like).