[zeveb]

> What harm is caused by using non-gendered language in commit messages?

It wreaks violence on the English language. I love our language (and others: many languages are beautiful in their own different ways), and modern denatured, bureaucratic English is an atrocity.

> But if it matters to other people, why complain about it?

Because I want more beauty in this world. Because I don't want the sort of people who desecrate my mother tongue to win.

[DanBC]

Singular "their" has been in use since the 14th century. No "harm" to the language is done with this long-established usage.

http://pemberley.com/janeinfo/austheir.html