To give you some idea how versatile a language server is, I wrote one once to provide go-to-definition between two related blocks in a large proprietary YAML configuration file. If the definition was missing, it would also render the red squiggly line to indicate that something was misspelled.
Another time I used one to make the hosts in my SSH configuration file clickable to either open a terminal with a session or just to display cpu/memory statistics.
Lots of neat editor-independent interactions can be enabled using language servers.
I've been thinking about this comment for a few hours now! I love it! I like building VS Code extensions and realized quickly the benefit of writing the logic in an LSP but I would never have thought to do the SSH config thing you describe.
I've now started a Makefile lsp since you've inspired me to think about the painful scenarios that LSP can solve if I think a bit wider.
Cheers for that!!