I wonder if the ability to easily “unfollow” a batch of unknowns one has just given coarse IDs would ease this issue? Then one would never see any notifications that a comment has been left, polite or otherwise. Unless of course they get so amped up that they just have to send you a personal message about it…
If I give something a coarse ID it’s because I have no idea what it is at lower levels, and so I really won’t miss knowing when someone else has given it a finer ID.