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I will however grant the concession that the reporting of an eyepieces RFOV in no way means that the eyepieces AFOV should not also be openly reported. In fact with both numbers reported, loads of detail can be calculated regarding the inherent distortions present in the design, so both must be reported.
You could perhaps get an idea of the linear distortion present in the eyepiece. However, it seems like this could unfairly stigmatize eyepieces that correct for, say, astigmatism by using a non-orthagonal field.
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Re: Strange Results in Eyepiece FOV Comparisons