The beauty of Emacs though is that it puts the user in full control. There is nothing in the world stopping anyone from modifying anything in Emacs (at least on the Elisp layer), hence packages like this.
VS Code on the other hand is designed to fracture [1]. MS can and has given proprietary API access to their blessed tools, forcing others to go through their much less capable extension API, hence the plethora of vscode forks. Even if you had the most motivated, excited group of people wanting to work on the latest and greatest LLM interactions with VS code, they would most likely be forced to fork. On the other hand, it just takes one motivated Elisp dev to implement whatever they want and make any external package they want integrate with it.
Also, I think the derision from the Emacs community may be a bit overblown. I'm constantly seeing AI/LLM related plugins appearing for Emacs and they tend to get decent traction (e.g. https://github.com/karthink/gptel).