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Re: What exactly IS a dinosaur?

So, what's a dinosaur: an animal that's more closely related to Saurischians
and Ornithischians than it is to other animals. In genealogical tree terms,
something descended from the most recent ancestor of S's and O's (and so
descended from something that WASN'T an ancestor of any of the non-dinosaurs

More precisely: the most recent common ancestor of S's and O's, and all of its descendants. The way you wrote it, that MRCA would itself not be a dinosaur, so Dinosauria would be diphyletic...

phylogenetic taxonomy

Phylogenetic nomenclature. There is no such thing as "phylogenetic taxonomy", even though you can find that expression in the titles of papers from the early 1990s (and more recent ones by Sereno).