I don't think they mean RPC in the sense of rpc(3), but rather things like gRPC or protobuf. The point is that if both sides really just want to talk gRPC to ea

I don't think they mean RPC in the sense of rpc(3), but rather things like gRPC or protobuf. The point is that if both sides really just want to talk gRPC to each other (and never want to talk plain TCP to each other), then that use case is "easy" to meet by implementing gRPC on top of Homa.