I clarified it on the Lemmy Defense matrix channel since then. I'll try to get this added as a feature, be it on Lemmy or Piefed, let's see how it goes.
Thank you for your nice feedback. I just created a thread on [email protected] , I'll definitely include this.
FYI, at the moment the only people who can know the list of subscribers to a community are that community's instance admins, via the database directly, so not something very accessible for mods.
There were quite a few concerns when the migration was suggested that people would not see the pinned post. We tries to mitigate that with the notification. Sorry about this.
Don't you get a notification when people reply to one of your comments?