I think IDLs and gRPC in particular are a meaningful advancement in the problem space. The ecosystem and productivity that they enable via programatic tooling w

I think IDLs and gRPC in particular are a meaningful advancement in the problem space. The ecosystem and productivity that they enable via programatic tooling were really eye-opening for me (The OpenAPI ecosystem is, imo, extremely poor). They also have better support for modern techniques like streaming and even load-balanced streaming.