Use of gendered language is marginalizing to nonbinary people.
It's easy to figure out why these changes are being made in particular, once you take a position of empathy.
Write new books. Make them as inclusive or exclusive as you want. I just think it's very telling that you hear so much about "erasure" and yet changing an author's words and intent like this is celebrated.
Moreover, when I feel empathy with someone who feels different and unrecognized by society, something still keeps me from advocating for the censorship and misrepresentation of a writer's ideas and internal logic.
I think what's stopping me is the knowledge that if I'm fortunate enough to write something that lasts beyond me, I sure as heck don't want anyone updating it for the sensibilities of 2053. Putting myself in someone's shoes, I think there's a word for that