I am really getting a kick out of all the people that are saying this is catering to people who know nothing and don't know how to cook. Some of the folks I have been talking to that are most excited by this change are very well established cooks with enough statues, barreltops and crowns to fill up a room.
The other thing I'm amused by is everyone worrying about something they aren't going to be doing. If you like what you are doing, stick to your guns. If you want to experiment and start doing something different, then go for it, the new rule allows you more flexibility.
Personally, I am not seeing a whole lot of advantage in cooking all the muscles separately either grilled or cooked slowly but I have not done a lot of experiments either. Most of us have adapted our processes to already accomplish what this rule change seeks to do. I still think that this just gives cooks some more leeway to be more creative, which i think is a good thing. I'm as worried about pork fatties as I am brisket burgers and chicken salad.
"What sort of people are these charcoal masters? They behaved badly and were unconcerned with appearances. Their hair was long and unkempt and their clothes were wrinkled and old. They drank beer to and from the crab house and they made rude noises while we cooked." Tao of Charcoal