scaatylobo, I appreciate your input on this subject, and do not doubt your experience. Please do me the favor of not making sweeping assumptions about how I practice, what training I have received, or my own experiences in stressful situations when I tell you that I do NOT agree with your point of view.
Debating tactics and techniques is one of the main themes of THR, but automatically casting people who do not share your own opinions as being overconfident, untrained, unpracticed, inexperienced rubes is not debating, and is not far removed from name-calling.
For my part, my logic for using weapon mounted lights is thus:
I believe that weapon mounted lights simplify, rather than complicate using firearms in low-light conditions. It's easier to flip a switch on a firearm than manipulate two separate devices in two different hands.
In addition, my home defense weapon is a pump action 12 gauge shotgun. I CAN'T use a hand held flashlight and still operate the weapon. As much as I see the debate about handgun-mounted flashlights, I have never seen any debate about flashlights mounted on shotguns, or much debate whether a pump action shotgun is an appropriate home defense tool.
Could I assume by your logic, that you believe a shotgun should not be used for home defense then? If so, I disagree with this opinion as well.
Now to my next point, and this is one that I'm surprised that I don't see mentioned very often.
In my experience, it's the shape of the area around the triggerguard that makes a concealed handgun potentially print 'gun' to onlookers. A handgun with a flashlight mounted in front of the triggerguard changes the distinctive silhouette into a much more generic one.