Yes, DP breeds expertise. But I don't think you can just decide to do DP.
An expert craftsman/woman does that craft everyday because they LIKE doing it, expertise might not even be the goal. Think of Nobel Prize winners, is the core thing that they did DP, or is it they were having enough fun (loose definition) that DP is how they wanted to spend their time.
I think the lesson for a young person is still find what you love. But with this you can say: find what you love, then sacrifice yourself to it.