I've learned long ago that you can't rely on 'good engineers' to keep up good practices over a large amount of people. Eventually the bad practices happen unless it's set as policy by the heads of the C++ platform, and enforced by scripts and management. It comes down to an education thing, since most C++ devs you hire will use boost & STL.

And de-templating, removing stl & boost from 300k+ line projects and debugging it all is something most orgs wont swallow.