Send email notifications to the "display Author", and not the the "backend author" (createdby)
Sharepoint online now sends notifications to Authors for comments on pages/news.
problem is: this email is sent to the backend author (CreatedBy field), which is not editable.
You can change the display author near the title, but that is not used for notifications.
Which means, if the original author changes/leaves the job, we cannot redirect notifications no anyone else.
So, you either make it possible to change the CreatedBy field, or you send notifications to the display author.
Matthias Habegger commented
This is really needed, because it is also possible that a user is creating the side for another user but the "real" business-owner of this page is the second user.