Priorities that are never ranked do not stop existing. They are settled further down the organisation, by people who lack the authority to explain the decision afterwards.
An unranked list is not a plan
Where leadership states several objectives without saying which yields when they conflict, the list is a description of ambition rather than a set of instructions.
Conflicts are guaranteed, because objectives compete for the same people, budget and calendar time.
Somebody has to resolve each conflict as it arrives, and by default that is whoever is closest to the work when it becomes unavoidable.
The decision moves down without the authority
A manager who chooses one objective over another has made a judgement about company priorities that they were never mandated to make.
When the deprioritised objective is later missed, the explanation available to them is that they had to choose, which reads as an excuse rather than a decision.
This is why managers in that position tend to attempt everything partially, since visible partial progress on all fronts is safer than deliberate progress on one.
Partial effort is more expensive than it looks
Work spread across several initiatives incurs the setup cost of each and completes none, so the organisation pays for four efforts and receives the benefit of a fraction.
Incomplete initiatives also consume ongoing attention, since something half-built still requires maintenance and explanation.
The accumulated effect is an organisation that appears fully occupied and finishes very little, which is the characteristic pattern of unresolved prioritisation.
Teams read priority from behaviour
Staff work out what matters by observing which slippage causes a reaction and which is quietly absorbed.
Where the stated priority and the escalated one differ, the escalated one wins, and the stated version loses credibility for the next announcement.
Repeated often enough, this teaches teams to disregard formal priorities entirely and wait to see what generates pressure.
Ranking is uncomfortable because it is a commitment
Publishing an explicit order requires accepting in advance that something will not be done, which is politically harder than stating that everything is important.
Leaders who make the ranking explicit take responsibility for the trade-off rather than distributing it downwards in pieces.
The organisational benefit is not that better choices get made, but that the choices are made once, by people who can be held to them, rather than repeatedly by people who cannot.