The Physical Surface root can do a lot of what the Principled BDSF does. Plus, the way that the devs (and I think it was pretty much one person writing the code) integrated Cycles means that it is possible to mix and match between Cycles and Poser nodes to an interesting extent. BTW the nodes that aren't in Poser needed too much time to code UI stuff, that's the only reason there are some missing. An update building on Superfly (as its a few years out of date now) would be great, but the work that was done was done well ;)

As far as making materials easier goes - well, opportunities for content creators, surely?

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