It's more than that though. Have you read it? It defines execution behavior (execution and validation algorithms, response shape, etc) and not only the grammar. We can argue about the quality of it all day but it is not just a grammar.
Think of what the Common LISP, Java, or Python specs would be if you deleted all of the specification of the semantics. The horror of it is that people would make languages that look like Common LISP, Java, or Python but they wouldn't interoperate and when you zoomed in on the details they'd all behave in nonsensical ways because, with no guidance to correct semantics, people will make up wrong things.
We live in an age when we are informed by good specifications. ALGOL and PL/I had hopelessly flawed specifications that weren't really implementable... There were lawsuits over COBOL specifications... But Common Lisp and Java were two early languages developed by adults.
In 2022 we should be at least up to a 1984 standard for writing standards.
