Resolution: Won't Fix
This is related to
The idea is that if I have a watch on a page, then I would like to get update notifications from the author of the change. That would allow me to directly reply to the email that I get in order to give them some feedback.
The concern in
CONF-5792 was that for a public facing confluence instance, spammers would set a bunch of watches in order to harvest email addresses. That concern completely makes for externally facing instances.
On the other hand, this is not a concern for internal only systems. What ends up happening on our instance several times per week is that someone will respond to a "page was updated notification", which ends up going to a black hole.
When a user gets a notification of a change by a specific user, it is just natural to be able to send them immediate feedback.