[derbOac]

I agree although I've always interpreted it as a combination of difficulty explaining complex architecture, and also not really understanding why things work the way they do. A lot of modern AI sits in this kind of quasi-empirical realm just above (in an emergent properties sense) analytic math and statistics, and it seems like there's not a very good integrative account or understanding of what's going on, or a way of deriving what direction to go in. So you end up with poor explanations in part because the authors of the structures themselves don't quite understand why things are working as they are.