If you can't show that a specific breathing exercise is somehow better than an essentially random breathing exercise, then it doesn't matter what kind of breath

If you can't show that a specific breathing exercise is somehow better than an essentially random breathing exercise, then it doesn't matter what kind of breathing exercises you do. If you can't show that a breathing exercise is better than e.g. same time spent on stretching, then there's not much point in doing (separate) breathing exercises at all.