I wonder what the general response would be if this conversation started outside of the Glock forum. I have no opinion on WMLs, I carry a 26 or a 42 or a gen 2 22 sometimes, none of which have a rail for a light. I carry a handheld and seem to do just fine, though I have never had to draw on anything or anyone day or night. A lot of folks carry guns without rails for lights, a lot of folks don't even carry a hand held light outside of the home, some gun makers don't even make guns with rails (like Kahr for example). A lot of Glock owners will put as much stuff on their gun as possible because Glocks are like AR's, so many toys to adorn them with it's hard not to.
For me, carry is about weight. I know some guys like to carry a full size pistol, two or more mags with a light on the pistol, light clipped to their pocket and a knife or two to feel comfortable. Some folks carry even more than that to feel comfortable. For me, I like my sub-compacts, light weight, easy to carry, a small hand held that slips in my pocket, wallet, keys, and an average folder. Much more than that and I am too uncomfortable to bother.
Home defense on the other hand is different. If I had a pistol with a rail at home, it'd have a light on it for sure, virtually no reason not to. No reason to not be using a full-size pistol at home either.
Just my .02, to each their own.