Thanks for the suggestion. You're right on the money. I did that early in my rifle red-dot experiments. It was an important factor.I have another revelation for you.. Try covering the front of the Red dot with a piece of tape and you will find you can still see the dot as well as the target. I'm just as accurate and fast with the lens of the dot covered as I am with it uncovered.
I have had enough students in class that I'm comfortable saying that most people can not separate the input from both eyes seeing the target with one and the sights with the other. More power to you if you can shoot as well with sights as with a red dot but that isn't the case for most people..
When I walk past my rifle I always want to shoulder it and point at some "target." My Sig Romeo5 has a pair of lens covers attached by rubber straps (front to rear cover). Lately I just leave the covers ON and find it easier and easier to see my target centered on the surface of the rear cover.
So like I said, "We don' need no steenkeen red dots." I'm pretty sure I could hit center mass at 100 feet with just my lens cap.