Great article. One thing to keep in mind, is that when these guys are running optics, they're not Sightmark, TruGlo or Primary Arms. I have however, seen people not be able to finish a match due to optic failure, or take forever because they lacked a rear sight, and usually it's a "lesson learned" kind of deal.
FWIW, I like a true cowitness height Aimpoint Micro, and YHM QDS backups.