I agree and one thing that is missing from this discussion is that many document databases are atomic around a document update. That gives the developer a very

I agree and one thing that is missing from this discussion is that many document databases are atomic around a document update. That gives the developer a very easy model to work with for a lot of things, you can update any part of a document without conflicts. In a relational system that would probably require updates/reads from multiple tables. Of course it won't work for everything but you can get an easy model to understand.