If the optic is occluded is there still a dot to see? The RDSes I have used there is not. I'm familar with the OEG concept, but you still need a viable, visible dot. You can also alleviate the problem via coatings, but as was said, anyone who has worn glasses can relate that this is a problem, and if the conditions are right condensation will appear on almost anything.
As I said earlier, I'm not opposed to the idea- indeed, I can see the advantages, and I favor the RDS on rifles. But the failure mode must be addressed first.
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