See Fred's comment above - the one thing that's different about our SDK vs typical JS libraries is that Gmail is a moving target AND several extensions may be working modyifying Gmail at the same time. It's really important that developers are on the latest compatible versions of the SDK.
The app id's are used to reach out to developers who may be on too old of a version of the SDK.
All that being said, seems like we could make this opt in. Another idea might be to post warnings in the dev console (in dev mode) if the version of the SDK you are using is too old. We'll explore all of these but have other ideas?
