[andrewla]

For me, it's the use of Lua. I switched to neovim in no small part for the sane defaults, the XDG layout support, and the async/terminal stuff (and I found the code simplification, addition of tests, and removal of ancient legacy stuff to be very appealing).

The terminal and async stuff has been "backported" to vim, as it were. But the plugin ecosystem is diverging. The other items are still open, and maybe those will move forward.

At this point Vim9 is the clearly superior language (don't hate me) since it's very domain-specific, while Lua has only very primitive hacky support. But the plugin ecosystems have diverged -- I don't see NeoVim coming back home without native Lua support, and I definitely don't want native Lua support in vim.