Messages separate the comment from the object
An approval in a chat or email can outlive the draft it referred to. Review queues keep the comment attached to a specific version.
A queue makes waiting visible
Teams can see ownership, age and blockers without asking for a status update. That visibility is useful even before any automation is added.
The final state still needs a human-readable record
Record who decided, what they saw and what happens next. Automation should reduce hand-offs, not erase accountability.