Portfolio judgment has to consider both the investments and the business they create together. Shared capabilities, dependencies, overlapping benefits, and competing demands on implementation capacity change the returns available. A sound comparison accounts for those relationships before treating individual business cases as additive.
The choices themselves deserve examination. Combining initiatives, changing their scope, or designing a different operating arrangement creates alternatives that a ranking exercise never considers. An unattractive project can become worthwhile in a better configuration; an attractive one can become unnecessary.
Sequence changes the opportunity as well as the schedule. Early investments establish capabilities and commitments that later decisions inherit. Experiments produce evidence before larger commitments become difficult to reverse. Flexibility has value when it preserves credible alternatives, but its cost belongs in the calculation.