I’ve written an article about themself and what it means for the upcoming 17th edition of the Chicago Manual of Style to make its language guidance more inclusive. It’s over at Conscious Style Guide, where my brilliant fellow Robinson Prize winner Karen Yin is doing fantastic work on inclusive language.
This is a big deal for grammarians and the LGBTQ community alike. Themself has been considered nonstandard for hundreds of years; try to write about it and you’re likely to find Word or your phone autocorrecting it to themselves. Yet there’s no question that it’s needed and that it provides greater clarity as well as respect.