@-AM0UR-, wattpad updated the private message informational section. there is now an explanation for why they're deleting it. here's the text:
Wattpad is first and foremost a platform to read and write original stories, and we have transformed the way the world reads and writes fiction. Providing a platform to cultivate writing and reading communities has always been our top priority.
While dynamic, open commenting has always been embraced by our users, direct messaging has only been relevant to a small percentage of our global user base.
Users can still communicate via commenting on stories and profiles. Writers will also still be able to connect with their followers to share news and updates via their writer profile.
so... essentially, only a few of us used it so they're getting rid of it. that's the public story, anyway. personally, i'd love to see analytics supporting that, but i'm a cynic lol.