Notes
We want to test the fact that subdocuments need to be part of the content of their parent.
Adding one block per subdocument might be a problem if the document has 1M subdocuments, for example. also it would be hard to sort, filter and control the list
We can also show a query block. We can add a hardcoded ID to this special query block.
We can show a view defined by the app, similar to what we had before.
Problems with this approach
The database experience
The database experience, where you might want to see a database view of documents, with features such as tables or order by activity.
The performance issue
What if Wikipedia uses a seed and adds millions of documents to the home page? Parent documents will receive changes for every new subdocument added, which could worsen performance issues.