Calcium based products are also used to staunch bleeding when various pets such as cats, dogs, birds have their nail done and they are actually cut too short, inducing copious bleeding. The powder IMMEDIALELY stops the bleeding.
As to who would not use something because it works...just look at past posts here by a few who ask interminable questions and NEVER seem to report back their experiences ACTUALLY TRYING anything they are asking about!
People now-a-days are MUCH STUPIDER than they were in the past, unfortunately. Modern education dumbs one down until one can not think and reason for oneself all too often!