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I think it comes down to what the intent behind the comments feature is. Is it:
(1) A communication channel from the viewer to the studio to surface feedback.
OR
(2) A forum for users to discuss/rate the content between themselves and for other consumers.
The way it's implemented today, it seems to be (1). In which case it would make sense to give the creator full control on deletion of individual comments and blocking of users. I get what @clayt is saying though, if someone takes the time to write out thoughtful feedback, that would benefit others as well. And it would be unfortunate if that was removed.
But ultimately if the purpose is (1), that should be the studio's choice. That way the studio can take as much or as little feedback into account as they choose. This is inline with how other platforms handle moderation (ie Youtube). It also creates a greater sense of 'ownership' of their channel on the SLR platform, paving the way to other benefits down the line.
I suggest that if any comments are deleted, this should be visible on the commenter's private comment history page (with an optional reason from the studio). That way there is a feedback loop - the commenter would know what aspects of the comment the studio was not receptive to. And may help them deliver feedback in a more constructive way in the future, or avoid that studio altogether.