That's a valid point, though I think that goes for any defensive tactic other than M2M. I was wondering what the benefit was of 2-3, or specifically what it is NOT, since most people say it's not helpful. However if you want to weight the risks and rewards you need to know what both are. The risks area clear but I was wondering if the people that say 2-3 zone is bad have any numbers or facts to back up that statement.
I am a fan of the 3-2 against LI, because really the best way to defend IS is to not allow it.