Seeing that sometimes emails can be very sensitive, woudl love to have the ability to completely hide marketing emails and only show them to specific users.
This is already a feature, it's called email partitioning. It's currently in beta. "In your account settings, you can automatically restrict access to newly created assets so that only the asset creator, their team, and any of their parent teams, can view and edit them."
Let me know if that answers your query, if yes, this thread could be moved to the discussion section of the community.
Yup, for email partitioning, seems that it's only available for Marketing hub enterprise and above. However, I personally believe that setting an email to "private" or not should be a more basic feature that requires, at the most, a professional subscription.