Re: Sigh. Not again.
What the commenters miss here is that AC is a *blind person*. So yes, screen reading software for the visually impaired can choke badly on PDFs. Many of the PDFs I receive are actually pictures of a printed page, say captured with a scanner or phone camera. So they're really not editable... Find a visually impaired friend with a Braille computer or screen reader and ask them about PDFs.