Technological complexities should be compared individual sector-wise(for example, semiconductor fab or CNC) so that we can reasonable discuss whether overall technical superiority exists and whether it is significant and whether being less complex overall is good, but I can see how a "complexity" metric is worthy talking about since as technologies get better, it necessarily gets more complex. However, I don't know what financial complexity actually implies for a society. For example, a CDO is highly complex and perhaps highly profitable for someone. But is it actually any good for the society at large?