You find out a project lost money after it shipped
See margin while you can still act on it
The Margin board shows what each project is actually earning you, worst first. Quoted value against hours logged and what those hours cost, with every project banded: At risk under 15%, Thin under 30%, Healthy above. A projection shows where each one lands at the current burn.
It also flags what it does not know. Hours logged by someone with no cost rate count as free, and the board says so instead of flattering you with a margin that is not real.