I guess I saw the early danger of WMLs (Light or laser) because it does mark your position. Additionally this means in a high pressure situation you are aiming your pistol in a search. I don't know how many here have been in a stressloaded search. Many many years ago I was in a medium sized city during a search for an "Armed Suspect" (p.s. he wasn't armed and he was actually a convenient target for the woman who was mad.
During the search my partner and I were upstairs doing our search. There was a rookie and the Sgt downstairs. The rookie with his flashlight (old days the mogamba flashlights and wheel guns). Junior turns a corner and sees a man with a flashlight and a gun at the end. He yells and then there are 3 shots in quick succession.
He blew the **** out of a mirror. Now this was a trained (albeit young) officer. The issue, he was searching with his finger on the trigger. It happens so easily. That was a 357 with a 11 lb trigger. I can only imagine if "Jim Bob is searching in the dark with his WML and suddenly the kid (who didn't follow the stay in your room directive) pops up.
Having a separate light does mean I am more or less using a single handed grip (Granted its going to be almost point blank range) I can use the light to quickly sweep around without the result of being surprised by a non target......