My #1 complaint is that for all of the complexity there is no primitive to draw a circle in PDF, instead any ‘circle’ you see in a PDF is an approximation based on Bézier curves. (I thought I was uniquely untalented because I couldn’t draw anime characters with Bézier curves but when I looked at the resource packs for my favorite game I found my favorite illustrator couldn’t do it either.)
I did a deep dive into PDF because I was pitching and sketching out the ultimate test extraction system for corporate use and figured PDF was the most important format to support and I could say boy is it tricky to get the correct text out with the structure properly mapped unless some of those obscure features were in use and it would still be pretty hard then.
We tried to extract pseudo-code test procedures out of an ISO Standard and ended up developing heuristics of how to piece the text together based on the color of the syntax highlighting. Terrible, terrible format.
At the moment I'd like to add OCR text overlays onto scanned documents and just can get myself to deal with the format for longer than ten minutes until my brain gives up.
I did a deep dive into PDF because I was pitching and sketching out the ultimate test extraction system for corporate use and figured PDF was the most important format to support and I could say boy is it tricky to get the correct text out with the structure properly mapped unless some of those obscure features were in use and it would still be pretty hard then.