Many times on one project there can be several Proofs that need to be approved by the same people. It makes sense to keep these are separate files because they do function as separate things and the approval of file A means the team can proceed while file B is still under review and iterations.
Ideally, I would like for the PM or Creative to be able to upload each of these documents, generate proofs and then bulk select and adjust the approvals needed. So, if the Art Director and Account Manager both need to be on all proofs as a reviewer & approver this can be set once instead of opening each at a time..
This functionality exists when it comes to sharing documents and granting access so it should be able to be replicated when setting approvers.