I mean calling it "a new API per message" is a bit of an exaggeration... the "API" per message is still the same: something with some set of attributes. It's ju

I mean calling it "a new API per message" is a bit of an exaggeration... the "API" per message is still the same: something with some set of attributes. It's just that those attributes are now set and accessed with getters and setters (with predictable names) rather than as struct fields. Once you know how to access fields on protobuf types in general, all message-specific info you need is which fields exist and what their types are, which was the case before too.