If we abandon displacement, yes these could be made to work. (Notice that Kerkythea, last I looked, did not support displacement but does support some very advanced lighting models.)

I'm actually not an expert on Firefly - stewer is. You should ask him. I know about some of its limitations, but I've never seen the code. I know, for example, that reflections don't track displaced surfaces correctly, but displacement was there first. Obviously adding ray-tracing to a REYES renderer is a compromise.

But there is no reason they should stick with Firefly. I really don't care too much what the renderer is and would be happy to use several dozen. What I don't want to deal with is several dozen different models for materials.

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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)