Swimming had this exact same issue a few years ago with the new full body suits that reduce drag too much. Each sports handles this differently and most decisions seem completely arbitrary with the biggest deciding factor simply being tradition. For example, no one cares that swimmers have always shaved their entire body and/or worn a cap to prevent drag. However the new suits just provided too big of a single jump to not require an immediate response.

One of the weirdest arbitrary decisions is the difference between almost universally banned "blood doping" and almost universally allowed "platelet-rich plasma therapy". You can draw a patient's blood and put it in a centrifuge to separate out the red blood cells from the platelets. Reinjecting the red blood cells is doping while reinjecting the platelets is an acceptable medical treatment.