monkeynotes seems to take the line that technical defects in claims others make fatally undermines their case, but technical defects in his/her arguments are irrelevancies.
For what it's worth, the same objection occured to me. The use of scripting I've seen in PDFs has been use-supporting and consistent with their book-like feel.
As someone who has had to extract data from large sets of PDFs and modern web presentation formats, I'm not a fan of either, really. Even verifying that a visibly presented string exists in a PDF document programmatically can be a non-trivial task, as with a given website as well. That to me says a lot.