I think of frameworks as running with crutches or cycling with training wheels. People interview potential couriers, look them in the eye, and ask: "DO you run with crutches?"

Not "CAN you run with crutches?" (as anyone who can run without crutches can run with them) but DO you run with crutches, as though running without crutches might signify a lack of ability. Fine time to unask the question.