Well, the problem is that it simply isn't POSSIBLE to expose a student to conditions of high flow in the caves in Mexico that are suitable for students. In fact, in all the diving I've done down there, I've encountered moderate flow ONCE, on an entry from the sea that I wouldn't have recommended to any Intro Diver, let alone a student. So how is someone supposed to learn to manage flow, in an area where there isn't any? And if your answer is that everyone should get their training in FL, I just plain don't agree.