[JoshuaDavid]

I feel like the unstated caveat is "there will almost always come a time when you need to do ad hoc queries, and there will almost always come a time when you need transactions or the equivalent." Which translates to "use sql unless you are sure your don't and won't need to do ad hoc queries or transactions." Which... seems correct.

[arduinomancer]

From what I've seen a lot of people solve needing ad-hoc queries with NoSQL by exporting everything to a data warehouse.