Hollywood is a land of rules and traditions, and most of them -- at present, anyway -- can be traced back to that one book.
You should actually take some comfort in that, though, because if you know where a problem starts, knowing how to fix it becomes significantly easier. Granted, Hollywood is never going to fix anything about anything and you should stop dreaming if you believe otherwise, but still, at least it could happen in theory.
Unfortunately, not every worst practice movie makers employ can be explained so easily. Some just seem to be universal laws that were handed down from some higher cinematic power that people who simply watch movies are not worthy of meeting.
For example, can anyone point to the screenplay writing manual that says ...