I think the parent is typing to say that the data is stored in a map which is read to a proto, etc. Kinda like what GPRC does over HTTP. Which kinda makese sens

I think the parent is typing to say that the data is stored in a map which is read to a proto, etc. Kinda like what GPRC does over HTTP. Which kinda makese sense. The schema gives you a great idea of what "should be", and the typing/errors/etc are understood by the host language.