<i>""All of these sights switch the eyes from the target to the barrel!"</i>
Nonsense.
As I clearly pointed out in my post, you have to keep both eyes on the target and use peripheral vision to bring the fiberoptic dot to the target. It takes a bit of practice to get used to it and for some people to train themselves. Those who have problems with watching the fiberoptic sight were probably bead checking unknowingly at times in the first place.
And the XDS is not a solution for me, because it would be destroyed during my first field outing. Hanging a blinder screen off the side of the gun might work on a trap field, but it ain't gunna hold up for me in the field. Also, when hunting in the field, we often are facing towards the sun. That thin frosted piece of plastic is going to get lit up like a neon sign from back lighting. There may be merit on the trap field for it, but I need a solution that works both on the trap field AND in the hunting field.
The Uni-Dot type sights work for both those who have cross-firing issues and those who do not. Plus, they do not require removal and replacement of the existing bead. They get installed in front of the bead. Less risk of damage.