My inclination has been to say that the opposite approach has the effect of burying the lead. 

I agree that the old docs had a lot of awkwardness with how we presented to this kind of background information but I'm more of the opinion is that it wasn't an inductive/deductive problem so much as a lack of structure and uniformity. Sometimes the big picture stuff rambled on for two paragraphs or more and I totally agree that I'm against that sort of proliferation. Adding structure and intentionally/explicitly limiting the 

I think *defining* the content of the title isn't a really good lead: the people who know what it means probably won't read the overview anyway, and the people who don't know what it means won't have the context to understand the definition until they've read more. 

Indeed, I think I'm making the argument to do things more like this: 

  https://github.com/mongodb/docs/blob/master/source/tutorial/define-roles.txt#L12-16