I get that it’s open source provided you use codium not code but I still find that interesting
It’s kinda like using chromium instead of chrome, isn’t it? Don’t use either; use firefox.
No idea what the editor equivalent would be though… Emacs or vim maybe? Next to noone uses it, but it has so much more potential, if only it where widely adopted.
There really isn’t for free, at least as far as I am aware. You are probably right that Emacs can come somewhat close with the right packages and setup, but VSCode extensions just makes everything so much quicker and easier. JetBrains is also similarly good, but it’s obviously not FOSS, and I guess it would be considered a full IDE not a text editor.