Here is a great post by Tom Bruce on all the problems with PDF in the legislative space:
a) It can’t be easily parsed or otherwise processed by computers. It locks up text in a way that prevents anyone but a human reader from doing anything with it (yes, I am aware that authenticity-scolds see this as a feature). That is not news.
b) It presents an almost irresistible temptation for the risk-averse, who see it as a safe, comforting format that is beautifully like their beloved print products and, best of all, prevents recompilation of data. The ability to repurpose data implies the ability to reconsider it in ways that might lead someone to question the conclusions drawn from it, or otherwise do something you might not like, and that is a very scary possibility.