I am a PADI trained diver, AOW with several specialties now completed, and almost 50 dives. I have been doing a lot of diving with DIR trained people (tonight was one of them). It is almost amazing to me what they have learned. Put aside the gear questions . . . They have beautiful control of themselves in the water. They can task load up the ying-yang and never lose their depth or attitude. They have very strong situational awareness, and excellent communication skills under water. Diving with the two guys I was down with tonight was a joy (at least when I wasn't being spastic) because they were so steady and predictable and easy to communicate with.
I'm sure there must be other places where you can learn all those things. But clearly, DIR training does it. And that is why I am taking DIR-F in November, despite the fact that the people who certified me and my friends from that shop generally think it's a bad idea. Of course, their disapproval is based on a perception of elitism and arrogance from DIR divers, which is something I simply have not encountered. Two great guys spent an hour babysitting me tonight so I could practice skills . . . come across as elitist to you?