Maybe if one enjoys endless conversations with unhappy customers. Easier to simply isolate the PDF rendering/parsing and move on.

A conversion tool would be useful.

Let me tell you about the lord and savior of the printing industry, the PDF/X standard...

It allows external sources. I think even the ICC profile can sit outside the document, as well as stuff like video.

I like the archivable series, the document comes with what is needed to render it.