You are wrong, on several counts. I suffer severe cross eye dominance. A heavier gun smoothes out my swing when I am "winking" my dominant eye closed. I have one more thing to think about at the moment of the shot, and your attention is exactly like your money-you only have so much of it to spend.
I've tried the sticky circles on the shooting lens, and all the other tricks. For me, winking is the only shot I've got.
The heavier gun helps, dramatically. Wish it weren't so, but, it is. I freely admit it might not be the case for someone else, however.
I don't see where anyone said it was impossible to shoot a light gun well, but, that is was tougher. For myself, I can get a lot further practicing with a heavier gun that fits me, in a lot less time, and for a lot less money, than I would with your 3" drop lightweight.
A few people might as well throw your gun at a target, as shoot it. It is far from as simple as anyone can do it, with enough practice.
Put me in that group, by the way.
Practice, for the sake of practice, helps little to nothing if your form is wrong.
It can actually be counter productive, if your form is far enough off.
I didn't imply anyone here was Digweed. I pointed out if it was as simple as more practice, nothing else considered, there would be more just like him.
But, there aren't. At least two guys said it was just as simple as more practice, nothing else considered. I call BS on that.
I don't know for sure, but, I'd be willing to bet George Digweeds gun's are heavier than what we are used to shooting.

I'd bet that isn't an accident, either.

Best,
Ted