I'd be careful about being prescriptive as it typically would not take into account differences in flight planning methods, operational capabilities, available infrastructure, or the operational requirements of aircraft. Moving to a statistical based fuel planning approach offers, IMHO, a greater level of operational realism without removing the CMD from the decision making.
As I said it might be painful, but I only see statistics being used to reduce fuel loads to the minimum.
Operational reality is that the majority of flights get direct routings and don't have to hold at destination and land at the first attempt. So they use less fuel than planned. Statistically speaking that is.