Neovim also has some surprising feature regressions compared to Vim. I tried switching to neovim for a while until I realized it was silently removing all ACLs on edited files and breaking services for me. Looking into it, I found that, for no clear reason, ACL handling was removed early on in neovim, and a bug had been open about it, with multiple pull requests that were never merged, since 2014 (https://github.com/neovim/neovim/issues/1200). Vim has never had a problem with this, as far as I know.