After new collimation tech came holographic sights and combat optics no longer illuminate correctly. They are very dim even in nightvision, and oddly dimmer than illuminated iron sights. They used to be realistically bright in NV.
That includes backup sights too in all scopes, like the new green dot on Nightstalker and RCO red dot sight.
New ACO SMG reticles are very blurry and no longer illuminate correctly.
I also see that Kahlia scope has red backup sight but it doesn't illuminate at all. (I am not sure if this is intended).