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I'd agree, and that's also optimum for extracting all you can out of a deep sky image too. Below 2 mm pupil the eye loses its ability to differentiate subtle colourations , which is often overlooked issue in planetary observing.
I remember comparing a view of Jupiter between an 18" and 10" in les than perfect seeing. The image in the 18" at X180 though somehat soft was a wealth of detail that were dilineated only by the various pastel colour shades of the features, whilst the 10" at similar power was not much sharper but the features, all in shades of grey, were much harder to see.
Mark
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