Would like to second the point about Neovim; I don’t think that we even need to necessarily embed the editor, Obsidian can probably do it in the same fashion that the VSCode neovim extension does it; by just using nvim as a “backend”: https://github.com/asvetliakov/vscode-neovim#how-it-works
I also commented on this thread about adding Neovim as a “plugin”, however I think we’d get 90% of “I wish Obsidian’s Vim mode could do X” requests by just doing it the way the VSCode extension does it and replacing vim keybindings with it entirely.