I guess I don't understand what entirely rules-independent "player skill" means then, other than moving into some degenerate cases ("mother-may-I" or "learn to second-guess your DM," each of which has been implicitly or explicitly rejected in this thread.)
I think the absolute easiest example is the Sphinx riddle, in my OP. The reason I like it as an example is it's relatively "clean."
If you think that riddles and puzzles (such as that one) should be tests of the player, then that falls into the "skilled play" divide. If, on the other hand, you think that those should be dealt with in other ways (whether RPing, or skills on a character sheet, or through shared authorship of the fiction, or whatever), then it doesn't.
I think that the problem a lot of people have when thinking about these issues is that we have gone so far away from this particular model, for the most part, that we don't often see it in pure terms. Instead, we see echoes of it in other conversations (inclusion of meta-game knowledge, RPing a low intelligence character, lethality as consequence, etc.).
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