Very true. I'm unlikely to take an arXiv article seriously if it hasn't been typeset in LaTeX.

And yet, in other disciplines, Word is the standard and you get very, very strange looks if you use anything different.

Source: wrote a psychology PhD in LaTeX.

Isn't using LaTeX instead of Word in the DSM-5 already, right next to vi and Linux?

Fortunately, there's no entry for emacs, so I guess I'm safe for now....