But if your optic lens hypothetically breaks, you'd lose both sights regardless of whether its co witnessed or not. Right?
So when you say "redundancy", it sounds like you're just saying that its more of a "piece of mind" thing that your POA is true to your POI? It just seems to me that if you're after a red dot sight it would be so that you don't need to line up the irons thus becoming quicker for it. I feel like I'm missing something. There must be another practical reason for co witnessed sights other than re assurance that your POA and POI are aligned.
The only other reason that I can think of, is that you'd only need to learn 1 muscle memory for both a co witnessed set up and for straight iron sights.
Everyone please chime in with your experience, insight and infinite wisdom.