The answer is money. Starship will both greatly reduce the cost to orbit, and the cost to design spacecraft (far wider mass budgets). I do not know how much C3

The answer is money. Starship will both greatly reduce the cost to orbit, and the cost to design spacecraft (far wider mass budgets). I do not know how much C3 it will have, but very likely a kicker stage will come along for interplanetary and possibly interstellar craft.