IMHO DIR is for divers that are nervous and insecure in the water so they enjoy over analyzing and complicating things, that with the team mentality gives them a warm fuzzy feeling making them feel safer (of course there are exceptions).To be honest if that's their thing great, I have nothing against it but don't belittle me because I don't dive with a long hose, have a bungied wing, and enjoy Solo Diving.
I have a hard time understanding is the fact they have a course called Fundamentals the prerequisite is minimal with maybe 25 dives. Yet over a couple of weekends they expect their students to dive like someone who has 300 or 400 dives in a 3 or 4 of years with many courses. and whats with the helicopter kicks and reverse kicks sure a good thing to be able to do but to fail a relatively new diver because he cannot perform them then sending the said diver home dejected, disillusioned, with maybe a probationary pass is pretty sad in my book, but hey they get to boast their grads are the best
Again to each his own I prefer to learn over time take courses as I advance my skills at my own pace rather than in a boot camp kind of setting.
Added to this if it wasn't for pioneers that think outside the box and like to try new things, techniques, different equipment configurations say like side mount, different gas mixtures, or RB's diving would never have advanced into what it has today. It would have been interesting to see how a squared away DIR type would have viewed matey strapping two bottles each side of him then jumping in the water before side-mount became known.