BIA (impact of business is focussed on how orderly prioritize if some disaster happens and how to deal with it - MTD, RPO, RTO, COOP scenarios etc.) -- I am favorable to priority of resources based on critical infrastructure/applications.
Establishing priority is first requirement. Criticality of resources begins with knowing what must be restored in a disaster or crisis. Dependencies will be the next requirement, to preserve or plan on behalf of the systems and components.