It's fast? Not as fast as an LLM.
LSP code completion? Not as good as LLM completions aware of your entire codebase at once.
Snippets? These don't matter if an LLM can just make them up on the fly.
We've entered a new paradigm of what it means to be a good code editor. I'd love if Sublime added the LLM chat and code diff from Cursor but I think the new way to edit code is going to look a lot more like having a conversation (text or voice) with an LLM that's making the changes for you.
I'm not saying don't use LLMs. Use them in ways that increase your skills, and be wary of using them in ways that atrophy your skills.