Circling back to this:
I just had another situation where this feature would have been very useful. Long story short…a user has a discussion going on about a Discord server in a topic. This user went and posted what was essentially an advertisement in other topics. A user flagged the posts, and I dealt with the flags.
The posts were definitely spam by my definition, but I did not have an ideal option to deal with the flag! The flag wasn’t going to be deferred or disagreed with, so those options are gone. That left Agree with flag, Hide post + PM user (agree), and Delete post (agree) as the only valid options. I would have liked to have hid the post and PM’d the user, so I could explain why this cross-posting was not allowed, and asked them to keep discussion in their original thread, but I could not do so. Instead I used the delete option, and will have to PM the user privately. Everything else done via the admin/flags interface is visible to other admins/mods. Needing to PM a user regarding a flag should be too, especially considering that mods (unlike admins) cannot see my PM history…