Why do reviews only allow one party with control at a time?

It should be possible to create Shared Demo Board the same way as Direct Challenges work - by clicking name of someone… and if they accept, it starts.
That’s basically a minimum of abilities that should be available in Shared Demo Board:
https://forums.online-go.com/t/features-everyone-secretly-wants-on-ogs-but-will-never-be-implemented/32125/595
But also there should be button that will allow opponent to place stones of any color.
Logic is: anything that is possible in real life Go club when 2 people sit near Go board should also be possible on online go server.

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