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Again, I said unless you have a quick detach mount, that BUIS does you no good if he has time to switch sights (plunking or hunting), then a folding BUIS is not needed. A fixed rear sight would do much better in that role.
And yes, the effective range of an AR is 500 meters. That typically means minute of person with your 55 gr FMJ rounds. A 4x scope is plenty for that. For varmint hunting, then yes, a higher magnification is a good idea. Again, all points that I previously made.
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I get your point, but the point i'm making is that BUIS are not useless.
If you are out in the woods or on duty and your optic becomes unusable i.e. you drop the rifle and the glass breaks, or some type of malfunction etc, you will need to switch to your BUIS-- hence why they are called Back Up Iron Sights.
The problem with a fixed rear sight is that sometimes it does not fit under an optic. Also you cannot cowitness with a magnified optic, but i'm sure you already knew all that..
Are you saying that AR's with optics don't need BUIS?