My concern with using a package like this is that it's built on top of so much other stuff. You'll still be able to read the text forever, which is a big plus, but Pandoc, at least a couple of years ago, was tweaking its template formats so frequently that my attemts to extend them for my own purposes were continually breaking. Maybe things have stabilized now? I'd be worried that a project started using this package would need continual maintenance to keep it in a state where it could actually build PDFs.