What are you getting FOMO over? Been using Neovim since it forked from Vim and I'm very happy with it.

Lua has been a big boon to advanced configuration and the plugin ecosystem and Neovim supports everything I'd want and more. LSP and treesitter for instance are still better handled by Neovim.

If you dislike Lua (I'm not a fan) I recommend Fennel, but either way it's much better than Vimscript.

As for Claude there are at least two Neovim plugins for it. I use one of them and it works well but I can't remember which.