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.
That's not what they mean when they say empathy. They misuse empathy when they mean compassion.
I think they do it because even they understand it's indecent to say they pity all of these people.
empathy: The ability to identify with or understand another's situation or feelings
compassion: Deep awareness of the suffering of another accompanied by the wish to relieve it.