[rhaksw]

Good question. No, I wouldn't support that. The current system works and there is still transparency. One of the two people in the conversation has a chance to review the content.

It may be that inboxes are different from public or open-ended conversations. What often happens in the moderation of public conversations on social media is that neither person is aware that any removal or demotion occurred. So, even the user(s) whose content was not removed does not have a chance to rescue the content from spam.