I, too, agree that Nitrox is pretty simple, but that is not the history in the world of scuba.
- In the early 1990's nitrox was considered so dangerous that DEMA did not even allow workshop presentations on the subject.
- At that time, entire agencies were formed to teach nitrox, since the mainstream agencies refused. That included the International Association of Nitrox and Technical Divers and ANDI.
- When I was nitrox certified around 2000, I had to pass a 50 question exam that will filled with math problems. It was the hardest test I have ever had in any course before tech instructor exams.
- When I first started diving nitrox on trips to Cozumel, it was only allowed on one of the two dives of the day, and it had to be the second (shallower) one. When I wanted to use it on the first dive, I got a stern lecture from the DM about how dangerous it was.
- When I first started on ScubaBoard, the typical thread was all about how the scuba world is going to Hell in a handbasket because people were graduating without having completely memorized all the equations necessary to do proper nitrox planning. One person was absolutely outraged when he went into a shop to get nitrox and saw people looking up MODs on a chart rather than doing the math on the spot.
So things are evolving, but the past is close behind.