Comment by js8

I can't quite buy your example, because NoSQL is pretty much a reinvention of VSAM and IMS DB (not IMS DC).

Regardless, I don't think it's necessarily that the expert would not want to drop some design constraint. It's more likely that it is genuinely hard to decide, which of them to drop and which of them to keep, because there are so many and problems are complex.

But if you're somewhat new (not a beginner either), you don't see all these, and you can benefit from the ignorance. Unfortunately, I think it cuts both ways, it's far more likely that ignorance will actually hurt you. But for a small number of people, ignorance can lead to lucky innovation.