because for many people, not even in CS, 'he' is the default pronoun. There's a trend in writing now to actually use "she," when writing about a hypothetical person who is genderless, rather than "he." But not only could this be construed as sexist (i.e. akin to reverse-racism), but randomly breaking convention can be jarring to the reader. It isn't necessarily, but can be.

I'm just saying that I've read some papers by leading feminist theatre art/drama scholars, and even they use the masculine pronoun.

Also, I find it annoying that while you adknowledge OP's attempt to be gender neutral, you destroy her (see what I did there?) over a single pronoun, which happens to be gendered but is used neutrally.