I just wanted to point out this tangential comment from the article, which contains a really good point about data persistence:
"But in an orthogonal scheme you save it all, indiscriminately. The problem is not so much that it's bulky, though it is, but that the volume of semantic meaning that you are now committed to maintain in near-perpetuity is vastly increased. That turns out to be very expensive. The problem of schema migration as new versions of objects were developed (due to bug fixes or feature enhancements) proved effectively intractable."
"But in an orthogonal scheme you save it all, indiscriminately. The problem is not so much that it's bulky, though it is, but that the volume of semantic meaning that you are now committed to maintain in near-perpetuity is vastly increased. That turns out to be very expensive. The problem of schema migration as new versions of objects were developed (due to bug fixes or feature enhancements) proved effectively intractable."