Everything cannot be first.
A project list becomes a portfolio only when leadership can compare why work matters, what it depends on, who must participate, and what is displaced when it starts. Otherwise, priority is set by the loudest sponsor, nearest renewal, or most persistent vendor.
The goal is not a universal score. Different decisions contain judgement that arithmetic can conceal. A useful process creates common evidence, exposes non-comparable obligations, and records why leadership chose the sequence.
Deferral is also a decision. It should identify the consequence, monitoring condition, and point at which the choice returns for review.