It's important to point out that rust-analyzer uses some bleeding edge features of the protocol, so sometimes certain things won't work as well in editors other than vscode. That being said, I believe the rust-analyzer author has indicated that he would fix that up to use more standard features if rust-analyzer becomes the officially recommended IDE backend.
I'm confused on what you're asking, isn't that exactly what the Language Server Protocol is? You can use RustAnalyzer as an LSP for Rust & Vim, I use RustAnalyzer also as the LSP for Rust & Kakoune.
Remember that not everyone is versed in all subjects all the time. This might be the first time they are finding out about the LSP, or it might be the first time they’ve found out the LSP works with vim. No reason to assume any of this.
Sure, but is what I asked not valid? I asked some questions, and said I was confused by their statement. If anything, I acknowledged this, which is why I wrote "Language Server Protocol" and not just the acronym LSP that they had to look up.
Yes, your first sentence can easily be read as (I am only exaggerating slightly) “how can you be so stupid to ask the obvious?” Short form online communication is hard.
