Guidelines have consequences – intended and unintended.
I don't know what practicing clinician has time to write guidelines for other docs, but guidelines are nothing but trouble. The best medical care is both art and science. Knowledge is always incomplete, patients are individuals with unique situations, and all docs have their own preferences and points of view. Guidelines end up being little more than fodder for tort lawyers and time-wasters.
Worst of all, young docs feel as if they have to follow them. Many things go wrong when practicing by the book. Medicine is an art and a science.