I replied in a different comment (https://news.ycombinator.com/item?id=33922783) about the async patches, which is where the whole things started. Because the patches weren’t accepted as is, they hard forked.
That requires an incredible amount of arrogance.
Neovim is not better than Vim. It is (increasingly) different. They have made different choices, some of which are interesting, some of which are baffling, and most of which are just different, although I consider the removal of GUI support to be about as arrogant as the gemini protocol stuff. There is a pernicious strain of software developer that thinks that they know better on everything and that GUIs are bad.
I felt that way in 1992 or so, despite having been exposed in 1990 to X, because it was easy to pick on Windows 3.1 and (then) Mac users. I got over it because there are things which are better, easier, and faster with GUIs than without. Not everything needs a GUI, but if you want people to use your software, leaving it in the terminal is unlikely to be a long-term success strategy.