Perhaps you're correct, but I would say this article is the author explaining his criteria, and asserting that it might be useful for some other people, on both

Perhaps you're correct, but I would say this article is the author explaining his criteria, and asserting that it might be useful for some other people, on both sides of the line. Given that, I suspect that in one, two, five hundred years neither he nor his blog will be around. Nor anybody who read his blog. Even if his text had survived (perhaps someone goes digging though the NSA archives in a few hundred years), I'm sure that the person reading it will just intelligently substitute in the succeeding technology. So, what I'm trying to say is that the point about TeX is just a point of practicality. It happens to be approximately true right now, and the author has no information to guide him to an alternate conclusion.