I recommend you govern this work with Five Verbs (four rows in the project plan).
Draft, Review & Revise, Approve, Distribute.
Assign Draft to a junior but solid team member.
Assign Review & Revise to the disagreeing stakeholders.
Assign Approve to a tiebreaker, micro-escalation point, and/or the Project Sponsor.
Assign Distribute to stakeholders who should not contribute to the Requirements, but should receive the final version.
Five Verbs has teeth.
RACI has no teeth.
RACI has no interdependencies, critical path, duration, or sense of closure.
RACI work ... who knows if it's even worth documenting.
Force collaboration.
Force senior-ranking employees to have authority AND accountability.
Manage Up Without Kissing Up.
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