> In physics i have always been able to post [to] arXiv I'm fairly sure Sci-Hub (and book scanners like CZUR's) made DOI useful, even (and perhaps especially)

> In physics i have always been able to post [to] arXiv I'm fairly sure Sci-Hub (and book scanners like CZUR's) made DOI useful, even (and perhaps especially) for working and teaching physicists at large research universities with excellent librarians. Sometimes in the moment one wants to read something sufficiently old or inconveniently rare cited in an arxiv preprint or in one of its easy-to-click references. Or if one is Reviewer Number 3 or that person's victim.