Well people on HN worship PDF, thinking it's necessary for printing and you can't print HTML—so it seems not only the author forgot about CSS for printing.
Anything with a pretense of research gets published in PDF even on sites having nothing to do with academic publishing—while the content is two columns of text and intermittent meh-quality illustrations. Such need for PDF, wow. The explanation given is that people may want to read that from paper, but I asked my friends in actual academia, and they say everyone reads from screen anyway. Well I guess everyone in ‘research’ either has 14" tablets or is able to read 5-point text all day, otherwise they'd all have crippling RSI from scrolling.
Anything with a pretense of research gets published in PDF even on sites having nothing to do with academic publishing—while the content is two columns of text and intermittent meh-quality illustrations. Such need for PDF, wow. The explanation given is that people may want to read that from paper, but I asked my friends in actual academia, and they say everyone reads from screen anyway. Well I guess everyone in ‘research’ either has 14" tablets or is able to read 5-point text all day, otherwise they'd all have crippling RSI from scrolling.