I've written offhand things about PDFs before, but Ben Wellington is clear and straightforward in this post:
You see, PDFs are where information goes to die, rather than to be used.
If you have something to communicate, think *really* hard about whether you're okay with it dying. This goes for *way* more than just public data, too. Product info, scientific research, industry knowledge... Put it in a PDF, and it's frozen.
This is why Gongkai AM is on GitHub. It's a weird platform for most people in R&D and engineering, but one that allows for *way* more flexibility and longevity.