I'm actually at the opposite end of the spectrum. I can see how this was beneficial to them when reviewing the document, and if the title was... check out how we collaborate on published journals in our own Google Docs like interface, it would have made sense. But, based on the title I thought they were going to actually explain Google Zanzibar in layman's terms. Not just have a bunch of comments that required you scroll around to figure out what they were even talking about.
I understand your perspective. We've tried to keep this project neutral, so we were hesitant to link to our "What is Zanzibar" blog post[0]. We hoped that the abstract might be good enough for most folks.
One of the features our project supports that could not be done in Google Docs is having multiple sets of annotations. We could add another that assumes you know nothing about the space and helps provide a lot more context.