[jez]

This is definitely true but like you mention because there’s a common communication channel and message format, these language-specific RPC endpoints exist whereas before LSP, language servers didn’t have “custom” features because there weren’t IDE-first language servers at all.

There are already a more than a couple LSP features I wish existed, but in the mean time it’s good enough to have the (typed! and using rich data structures!) RPC endpoints exist for enterprising users to wire up to their IDE’s presentation layer.