I believe you're missing our point... Used properly, you don't look through a holographic/reflex like you would a magnified optic. You look at your threat/target, with both eyes open, and the reticle is 'automatically' superimposed over the target in your line of vision.
We teach this in training by occluding the front of the sight. The dot is still perfectly (sometimes more) visible. Light transmission through the optic is immaterial, unless you're closing the other eye and looking through it, which is not what it was designed for. If you're looking at the dot, you're doing it wrong, and IMHO this is why many folks decide they don't like RDS on handguns.
The threat focused nature of RDS optics on a handgun frees up a lot of vision and mental processing that were traditionally used up on sight picture; now that vision and mental energy can be used to evaluate the threat and process options in dealing with said threat.
