I do see hyphenation for the kids quite a lot, actually - despite this rant, plenty of fics DON'T have Hermione change her name, enough that I can afford to be my judgemental instant-hit-of-the-backbutton-for-Mrs. H Weasley self. Anyway, I'm not myself a huge fan of hyphenation, I agree more with the sharing that you propose, but at least I think people who are hyphenating are thinking about it. (Plus, it's the 80/90s, so they're probably temporally accurate, too.) But yeah, ITA.