Great minds think alike! We made this change with the aim of simplifying the interface by providing a default category rather than uncategorized. I like the name you have for this “anti-category”! 
We also will be seeding a default chat channel which will be in the general category.
We also are no longer seeding the lounge category by default. Sites that want a lounge for regulars can create one themselves.
Here’s the relevant PR: FEATURE: Replace the Lounge with the General category by oblakeerickson · Pull Request #18097 · discourse/discourse · GitHub
The first of a few PRs that will…
provide new users (and new admins!) with defaults that provide a simplified, human-readable, straightforward experience. They are able to understand how the site is structured, where users go to join forum discussions, and have an example to follow when customizing the structure by adding more categories and tags. Any of these default categories can be deleted by the admin should they so desire. We also have a category to put the general chat channel that is accessible to all users on the site by default.
This PR:
- Seeds the General category so that the general chat channel will have
a home- Does not seed the Lounge category anymore
- Moves the “Welcome to Site” topic to the General category
This change was intended to only affect new sites and not existing sites, and a subsequent PR fixed it.