Okay Greg, sorry for not quoting you, but I don't want to try to do as nice fo a break down as you did, just want to hit some high points thoughts.
As far as speed, I think it goes down to some degree on training and your personal eye's preference. While SGT York was brought up using notch and blade, i want to say from memory his reason wasn't for any tactical reason, it was due to it was what he was familiar with. No less of a valid reason, but doesn't break down that it is better, just common sense of grabbing what you are familiar with.
Doing some presentations with an AK and AR with irons side by side, with the aperture set to the large one(Further discussing that below), I don't find much difference in perceived speed, and find myself searching for the AK's iron's more often(Also tried it with a Mauser and did find that to be actually slightly quicker to target than the AK oddly enough. Here I think with quick to shoulder snap shots we actually are seeing fewer issues with sights and more with ergonomics actually, something to possibly think about). Now, I don't have a shot timer to put myself on, so that could be a fun experiment to run, from low ready to on target at various distance, time how long it takes to put a round on target. Even if the AR is slower, if you are making hits while the AK is missing there are data points to be considered. I'd like to try that from ranges as close as say 3 or 7 meters out to say, 50, or even 100. Use paper up close, go to steel at the distance maybe. Could be an interesting set of data there to be looked at. Run an AR with an RDS as your control. Would be even better if you could get an AR with a long rail and a set of fixed DD irons set at a standard M4's sight radius and a set of fixed notch and blade irons set at the standard AKM's radius and run that test to eliminate all possible variables with the RDS as a control. Then run the rifles out to 200 or 300 or even further. See which come out on top when variables or eliminated as much as possible. Would be an interesting set of data, or even study. Anyone wanting to fund that one?
Now, as far as BUIS falling off, I've honestly seen more optics mounts go tits up than BUIS in my experience. Some loctite, torque, and witness marks have always served me well, have not personally had one come loose and even there, if one is inclined you could just this side of permafix it to the rail should one decide to be married to that sight. Obvious others may differ. But at that point, I'd still say it not an issue with the type of irons as much as mounting system, you can bitch about the irons falling off, I'll bitch about the front sights on an AK walking left right and up and down, or being able to be adjusted inadvertently under hard use because of their design, we end up with a zero sum and have to buy more beer. So i am going to argue that that point is somewhat irrelevant to the discussion as far as the type of sights effectiveness goes.
As far as irons vanishing from rifles, we are really already seeing it. I don't care for it because I seen irons for the most part as cheap insurance and they make me feel all nice and fuzzy. Plus, for some shots I prefer my irons over an RDS. Maybe it mental, maybe it just insuring everything is lined up when I break the shot, but it is there.
Now, as far as low light shooting with an aperture, specifically the large one, I've spent time out behind mine at the range playing with it, figuring it out, and seeing how it affects my shooting and groups. With a 50 yard zero with my old beat to hell Bushy, which is my irons only rifle, I could plant 1 ten shot group with IMI M193 in about an inch, POA=POI with the standard aperture. Going to the large aperture I found my groups to shift down about an inch, and open up slightly, say 1.5 inches. For 100 yards it for practical combat shooting purposes was a none issue in my opinions other than groups opening up a bit for me from about 2 inches to about 3 inches or a little more, still more than adequate for combat shooting. inside 50 yards I would see no reason for the large aperture not to be viable and there is a second reason I'd take an AR with irons with that large aperture for me, over the AK, and I'll admit that this has to do with familiarity to a degree, but the AR to me indexes in the shoulder to engage better than an AK. An AR I can get it to my shoulder, eyes closed, and even if the LOP is off, as long as the LOP isn't insanely long, I can get my head indexed NTCH and my eye lined up with the sights with less issues than that of an AK where the sights are further away from my eyes. I guess I just feel more confident in taking a shot and making hits with the AR here, but again, familiarity, so keep that in mind. Now, does this mean the AK can't be used low light? No. And once you bring a white light into the mix I call it moot since you should then have enough illumination to see them, and at that point we are back to the issue up top as far as which is actually faster.
On the subject of rifles with apertures having a longer sight radius. I think this will depend on the rifle, If looking at your standard combloc AK verse the standard AR15 carbine/M4. The AK is believe actually has a slightly, longer sight radius. At least with my irons only Bushmaster and my personal AK the Ak's sight radius does edge out the AR just. Go to a middy and yes the AR wins, obviously a M16A2 would win as well. But then an RPK might beat them both, don't have one to compare. However, all things being fair, and I think in the spirit of the OP I think a standard M4 sight radius and standard AK sight radius are what he had in mind, at which point the AK does have a slightly longer radius.
"I don't collect guns anymore, I stockpile weapons for ****ing war." Chuck P.
"Some days you eat the bacon, and other days the bacon eats you." SeriousStudent
"Don't complain when after killing scores of women and children in a mall, a group of well armed men who train to shoot people like you in the face show up to say hello." WillBrink
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