I'd more say that it gets rid of the need for officially-supported client libraries, but such libraries can still be a nice convenience for idiomatically mappin

I'd more say that it gets rid of the need for officially-supported client libraries, but such libraries can still be a nice convenience for idiomatically mapping your service's higher-level concepts to what makes sense for a given language. Still, it's a big win to automatically make your API available in all gRPC-supported languages, since most companies can't justify the business cost of a hand-crafted library in even one of those languages, let alone all.