There's a distinction between PDF and PDF/A. I agree with favoring HTML over just any PDF, for all the reasons cited in the article. But for certain kinds of do

There's a distinction between PDF and PDF/A. I agree with favoring HTML over just any PDF, for all the reasons cited in the article. But for certain kinds of documents you'd want PDF/A over HTML or perhaps in addition to HTML. PDF/A can certainly accept, and a government policy can require the use of, accessibility features and also even digital signatures.