[apcherry]

We expect and accept a high false-negative rate. Our commenting system is optimised for zero false-positives at the cost of many false-negatives. This is a deliberate choice. So yes, I would expect to see a significant dropout of commenters who are clearly qualified.

The sort of people that we want to comment are likely to come back for another try anyway, and the long-term effect of this process seems to be doing what it was supposed to.