This statement makes sense for sprinters. When the task is short and powerful. Time spent refueling consumes a large proportion of time spent on the activity. It’s inefficient and expensive.
With longer, multi-day trekking, summiting Everest, or flying soldiers into a hot zone, there is always enough time to refuel. In these cases, not having enough fuel compromises the goal you set out to achieve. Time spent refueling is an investment, not an expense.
Our challenge is not in understanding the fuel, time trade-off. Our challenge is learning to differentiate marathons from sprints.
If you always fuel for sprints, you leave no margin for error. No margin for the unknown.