Earlier quoted context omitted.
PDFs are still ok though. There are many implementations of PDF parsers, many Open Source. It may not be as "universal" as plain-text, but it is definitely universal. At this point, I believe that all major operating systems ship with the ability to open PDFs for display.
PDFs are awful for the blind, most PDFs are very painful to extract text from.
PDFs are awful.
Could have stopped right there.