The only bar that the heuristic has to pass here is "delivers a result that doesn't suck as bad as the analysis in Reckless, Infinite Scope". The analysis in that article is so bad, however, that your heuristic can literally be, "if you encounter an item that was also in Drew DeVault's input set, then assign an arbitrary probability 0.9 (or whatever) of whether the item should be counted", and it would still give you a more realistic result than what the article says (and that people are actually relying on in their arguments—and that you are defending) here.
Aside from that, given how many logical errors and weird counterconclusions[1] you've managed to stuff into this discussion, though (and to have been able to do so economically[2]), I'm going to go ahead and say this is my last response to you that I spend more than 10 seconds writing out.
Define "reasonable" then, when talking about the web.