In reply to David Waumsley.

David, yeah, it is a bit simple. There aren't really nested blocks as yet, and the image flow thing is very fixed to one use case. Didn't say it for all cases, but it can be done, and that indicates to me that plugins adding blocks and formatting for complex cases is likely. At the same time, it indicates that maybe making content less complicated is more likely, and I see that as a good thing for the future of the web as well. Complex layouts are confusing and generally "bad", so maybe making those not the default isn't exactly a bad idea.