There are reasons why the instructors I've trained with don't use that position, and I've explained it.
And I have had experience training in shoothouses, simulators and force-on-force exercises, so I do know from experience what I need to be able to see and how I need to be able to see it.
I also have experience having things in my field of vision, so I know from experience how such things can impair my vision.
The Dunning-Kruger effect isn't psychobabble, it's a documented effect that shows up constantly in everyday life. And especially in the gun world.