Why is DIR diving so controversial?

Answer 1

This is a difficult one to answer. In general, the term DIR as it relates to diving refers to specific procedures that were developed by a certain group of divers. Some of these divers forcefully believe their procedures are the only way to do things. Many pf the followers then take the same approach and forcefully advocate against any other procedures, so those with differing points of view can be put down. But then others that disagree with "DIR" sometimes also take a hard line against it. So in general it is the same as many other sports or activities where some believe it should be done one way and others believe it should be done another way.