Lots of people just have rifles to play with them and they'll never have one in an emergency situation. When you keep it locked up and unloaded 99% of the time, you have time to check batteries and wipe off glass, or send it off for warranty service. A lot of people go to classes just for fun or to augment USPSA/IPSC/IDPA practice. There's very little "OH ****" to that, where seconds matter in the way they do to police/military, and people who plan for how to use their rifle for defensive purposes.Why not iron sights vs optic at a minimum for defensive purposes? It really pisses me off seeing guys slap on optics and no iron sights just in case. I'd say iron sights/light/sling or else it'd be like putting a laser on top of a revolver.
I think "OWLS" assumes irons already exist as a minimum. (correct me if I'm wrong in my interjection) I think optics is a "requirement" because they're such a "force multiplier" that it becomes a no brainer. Shooting in compromised positions, or less-weak-side becomes a lot easier with a red dot.