There IS a reason, and I bet you can guess it since I just raised it as an issue, but absent that knowledge you're not making as informed a decision as you could be, ergo you're less likely to producing an effective scene than you would if you followed the rules.
I'd change that statement into "... if you knew
You don't have to follow them if you don't want to, but you should know what you're doing and why you're doing it.
Good point. Long before Picasso became the greatest abstract artist ever, he was a superbly trained traditional artist. He may have broken every rule in the book when he turned to cubism, but he knew exactly what he was doing and why. Jean Luc Godard, did the something with a film in the 60's. He deliberately used weird camera angles and distracting cuts to create a specific effect. Going back to the Phase II episode "The Child", I really appreciated the fact that the director and editor worked in a very conservative fashion. I don't recall a single place where I thought an edit was awkward or distracting, which is an incredible accomplishment for even the best of fan productions. They got some criticism for being conservative, but I thought they did a great job and used exactly the right style for the story.