Every team and organization develops their own optimization strategies for staffing, assignments and utilization. The trick is not to fall in love with it.
If people are working off the best or worst case scenario, they’re not thinking effectively enough. Leaders teach others to think past hope. It means learning how to effectively consider a variety of outcomes. And to plan with each contingency in mind.
There is a tendency to shrink the goals of an organization to something attainable, so as not to demoralize the staff. The result of this kind of behavior, unfortunately, is the exact opposite of what was hoped for. The leaders leave and the folks that are left will need the goals lowered again. High performing organizations need to embrace stretch goals.