The longer the tissue is coagulated, the deeper the damage but the degree of damage is not apparent for days or even a week. If the surgeon were to over treat, the thermal damage from the coagulation would damage the normal underlying vital structure, i.e. the bowel in this example. A week after surgery the bowel wall could die off resulting in a hole in the bowel with the bowel contents spilling into the abdomen and at the very least the patient becoming very sick. I think you would find few, if any, use coagulation as their primary mode of removing endometriosis. Vaporization with the CO 2 laser offers several advantages.
Vaporization is the most precise surgical tool available for the removal of endometriosis.
Because the packet of light energy is so intense and focused, there is virtually no thermal damage to the tissue that is left behind. This allows the surgeon to remove the endometriosis layer by layer. The surgeon also has the advantage that the appearance of the remaining tissue is unchanged allowing an accurate assessment as to whether endometriosis is still remaining or normal tissue has been reached. This is especially useful when working on the vital structures such as the bowel, ureters, blood vessels etc. A good example of this is endometriosis involving the small bowel.