The generalist masters no single subject. Not Rust, not French, not thermodynamics — each of these is left to the specialist who will pursue Depth for a lifetime. What the generalist masters instead is the mastery of beginning: the act of walking into a room where they know nothing, and walking out dangerous.
This is the only durable mastery, because it is the only one that survives the obsolescence of its subject. Particular knowledge decays; the on-ramp does not. Learning-to-learn is a skill like any other, and it sharpens with repetition — the tenth cold start is faster than the first, the hundredth faster still. The arithmetic of breadth only works because beginning is repeatable.
So the generalist does not collect fields. They collect entrances, and rehearse the same move endlessly: arrive ignorant, leave competent, begin again. That move is the whole of The Generalist Manifesto.