You are quite right to point that out, MG. REYES micropolygon generation (is that called the slice or the dice - can't remember) is certainly at work in the render and not the preview. I made the communcation assumption that Laurie was referring to the "smooth polygons" render option, because she used the word smoothing. Testing for MP dicing is easy - change the min shading rate to a high number.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)