I don't think abstraction is even the right concept to be talking about here. Being able to work with an abstraction doesn't imply ignorance of the details, and

I don't think abstraction is even the right concept to be talking about here. Being able to work with an abstraction doesn't imply ignorance of the details, and ultimately the best code comes from people who know how to make abstractions that are elegant and aren't leaky (which takes expertise in both domains).