[usrnm]

Sending a request and getting a response back is not a new concept, it's about as old as computer networks in general, and gRPC is the only framework that refers to this concept as "unary". This is the original argument from the article and I tend to agree with it

[epgui]

Monads and functors are nothing new either, but that doesn’t mean giving them that name was a bad idea.

Moreover, the term “unary” is used to distinguish from other, non-unary options: https://grpc.io/docs/what-is-grpc/core-concepts/