Oh, Ed, great post, and a beautiful example of what DIR should motivate a diver to do!
I've done and passed DIR-f, taken but not passed Rec Triox. I keep making sporadic efforts at the gym and the pool, and I'm acutely aware that fitness is a significant part of the philosophy, and one where I'm weak. I work with a loosely knit group of divers who are serious about skills and teamwork, and we go diving for fun together, too -- FUN being a serious part of the DIR idea!
I keep reading and learning as much as I can about decompression theory, so I can order my dives in a rational fashion. I don't do my own gear maintenance, but I can disassemble and reassemble a lot of things now. And I carry a good set of spares and tools.
DIR diving is much more these things than perfect trim.