Since the 1400s my arse. It's just an annoying trend among woke evangelists, and makes the english language uglier while conveying less information about the subject in question.
> For your sake (Iewell) // I am glad at soule, I haue no other Child; // For thy escape would teach me Tirranie // To hang clogges on them.
[0]: https://www.oed.com/view/Entry/200700#eid1288185420
[1]: https://en.wikisource.org/wiki/Shakespeare_-_First_Folio_fac...
Either way, I suppose "he/she" could be used instead if that really is an issue?
They is more inclusive! ^^