I have a friend, who should be on here, whether he posts is different, who was in Iraq 2008-2009 time frame. He related a story to me while on a patrol having his Eotech shit the bed. Wasn't dead batteries since they had been changed that day, but the optic shit the bed so he was rolling around with his matech rear up. Now, he didn't end up having to shoot at anyone, but yeah, the point is there. So yeah, he for a long time was big on BUIS, and anti Eotech. In fact I am pretty sure he still is heavy anti eotech. So there is at least that. Now, i think with the rise of your LPVOs, some may argue that standard BUIS kind of become useless, and I am not sure I'd disgree, since most QD mounts, really aren't, not if you have them mounted right, My experience with Larue mounts for example, while they might be "Quick Detach" if they are torqued down proper, you have to get a damn good grip on them, and/or have something like a pull string. No way you're likely to get a chance to do that in a SD/HD shooting. Military application? Maybe if it a firefight with a team you might be able to have enough time. There were also pictures of guys running ACOGs, no rear irons, and people saying the guys had their carry handle mounts on them that if the ACOG shit the bed they'd rip that off and replace with the irons, so..... On HD with RDS though, again, we can argue benefits, if the optic shits the bed, or you haven't changed your batteries for 3 years and they are dead and you grab it and no dot, or reticule.... shoot through the optic. At least that is something I would be doing.
So to shorten up what is headed towards a fucking long post, if the build allows for BUIS, I am not against it. There can be the argument that it is risk mitigation. That said, I'd also hazard that for many of us, it is just cheap piece of mind because if that optic does shit the bed when we need it I am not taking that 2 seconds to flip the fuckers up I'm shooting through the tube, dead honest, but I am comfort with the "point shooting" more index shooting, stuff than most. Also, as always mission does drive the old gear train, and I know that horse has been beaten to death, then beaten into a horse shaped bag of giblets, and we are currently bashing it's sun bleached bones with rocks, it is still true. So, if you have to have them for departmental use, go for it, if you have enough faith in your optic, or perhaps the optic set up does not allow for BUIS, then okay. iI you have to run some weird set up with irons for piece of mind to have them, go ahead, you're not likely to catch too much stupid here, don't be surprised elsewhere though.