You describe the most effective way of relief under normal, if you can call disaster relief normal, circumstances. However as witnessed recently in the case of the Israeli situation. Sometime specific resources are needed in the shape of hardware, if these are in short supply and cannot be obtained locally then lifting in the necessary may be the only option.
Report in Lebanon: Israel Air Force strikes Syria's Quneitra, 3 terror operatives killed (Haaretz)
from the article: Israel sending aid shipment to Colombian flood victims