Until you want to update a protobuf definition and then tear your hair out because you cannot atomically ship changes to clients and servers. Even if the code i

Until you want to update a protobuf definition and then tear your hair out because you cannot atomically ship changes to clients and servers. Even if the code in your source tree says everything is a-okay that one service that hasn't been updated shits the bed when handed a proto with mismatched types. Thus, proto definitions become an "only add, never modify or remove" thing. Not ideal.