[pacaro]

And then of course there is the deliberately edit hostile way that PDFs can be (ab)used, by printing a document and then scanning it to PDF. In my experience some lawyers like this because it means that to suggest edits you have to retype or OCR entire paragraphs

[kccqzy]

I used to do a variation of this by converting all text to outlines in a PDF. It will even deter more people from editing the document. This also saves paper, and text will remain sharp (although slightly different because operating systems have different heuristics when it comes to rasterizing text and graphics).