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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.

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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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Astro-Tech AT111EDT f/7 - Celestron CGEM
NexStar 11 GPS
Orion SkyView Pro 8EQ (w/ Autostar mod)
15x70 Celestron SkyMasters
Orion 90mm Mak

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