Reference monitor doesn't play simultaneously in real time? How is it used?

I thought the point is to have two monitors playing back simultaneously for scopes / composite or to send to a secondary feed for clients, similar to video village on set.

Not sure why you started a new thread on this ..but anyway.
The reference monitor is not designed or suitable for a secondary feed to external monitors.
It is used to have two looks at same frame eg a composite and a scope
or two looks at  different frames eg unganged .  This maybe for a CC and grading comparison.
It is not absolutely vital that it plays in real time for either of these instances.

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