We also have alot of holding stances....but there is a scientific reason why it is useful. The muscle change is good. It is good strentching, getting blood to flow, good for health. But there is a reason why kung fu developed. Slow breathing movements don't make you a good fighter. You get what you train for. Chi kung for health is fine, but don't be dellusional.
Also, the muscle change was brought by Tamo to Shaolin. Tamo was Indian (RZA says Dravidian), and it wouldn't surprise me at all if these practices originated in KMT, especially after seeing some of the pictures in the PRT M HERU.
Wisdom is better than rubies and all the things that may be desired are not to be compared to it