Absolutely horrid feature. Supposedly it's to protect vulnerable people's privacy if they post in certain communities, but if they truly wanted that to be how it's used, they'd have limited the ability to apply the feature only to subreddits where mods have specifically coordinated with the admins to get approved as places where vulnerable people are posting. Or, and here's a shocker, they could just rely on the tried-and-tested method of using alt accounts. Instead, bots and trolls just hide their entire post history from people.

Now, supposedly, mods can see the full, unhidden history of any user who has recently posted in their subreddits. Which is good. But the number of other good-faith users being obstructed by this change is huge. It's overall a massive failure from Reddit.