the language server protocol doesnt support everything jetbrains does. they can extend the server as much as they want, if the protocol doesn't support the add

the language server protocol doesnt support everything jetbrains does. they can extend the server as much as they want, if the protocol doesn't support the additions, they'll be useless features unless they'll implement protocol extension, which could potentially be incompatible with the original... and they're back to the starting proposition.