This is exactly correct.
It's taking serious effort to try to work out what pain this solves that isn't catered for by the above options.
(wow this was painful to find)
http://www.youtube.com/watch?v=tPtJd6AzU8c&feature=youtu...
That style of fun product demonstration would be perfect for this type of app.
Also google docs now work offline really well and across multiple devices, which is incredibly useful.
But what I've found with Google Docs is that if someone is making a trivial change (like correcting a typo), they'll just go ahead and make the edit in the doc. If they're suggesting a substantial change, they'll add the suggestion as a comment and let the author decide whether to incorporate it.