OK, so several have figured out that UseCalc is in large part a spoof on usability research.
Too bad it didn't cause the response I wished for, which was some reasoned usability explanation for why calculators are done that way.
On the other hand, it turns out several people like Usecalc and have proceeded to reimplement it in other languages, and with different interfaces.
Which is quite good, too, even if it surprised me a little. Now I have to think about it, too. I mean, maybe there is real potential for the thing.