This article seems to make the mistake of thinking that things are either full Roy Fielding REST or it's RPC. OpenAPI is not similar to gRPC because it's noun-

This article seems to make the mistake of thinking that things are either full Roy Fielding REST or it's RPC. OpenAPI is not similar to gRPC because it's noun-oriented, not verb-oriented. gRPC is more like SOAP: ignore HTTP semantics and write method calls and we'll sort it out. OpenAPI is somewhere on the path to full REST: few verbs; lots of nouns.