gRPC bindings for languages that aren't popular at Google (e.g., Ruby, Node) aren't particularly mature. Each of the different language bindings is independentl

gRPC bindings for languages that aren't popular at Google (e.g., Ruby, Node) aren't particularly mature. Each of the different language bindings is independently maintained, so there is no guarantee of feature parity across the languages. We do not have Quark/DC running in production yet. Most of the adoption has been in the realm of testing scenarios (it's super handy to be able to generate client stubs).