Why PDF? Why not ePUB or .tex? Especially since "Preface" is already badly formatted (text too far to the left overlapping line numbers).
ePUB is notoriously bad at displaying mathematics. It also takes away the author's control of the page layout. To me there is nothing more satisfying than a well-crafted PDF.
And maybe someone can write some Machine Learning tool to "unformat" the PDF into ePUB.
Was very surprised that most academic documents aren't being published in DjVu [0] format anymore, very sad.
It's similar to publishing a binary program with or without source code.
I used to do this for reading arxiv preprints, but the script I wrote was kind of brittle and it doesn’t really work out with figures anyway
Honestly if the scientific community moved to something that could be interactive and reflowable I would be so happy