Alrighty, after the discussion last week, I've finally added the new groups, and everyone will have been mostly auto-subscribed to all of them. I'm still working on some of the details like adding descriptions, and there will be some awkward pieces and interface aspects since we're still in the transition phase before I get those larger changes to subscriptions/etc. in (which I really hope will be soon), but it should mostly be fine.
If you want to change your subscriptions quickly, use this page: https://tildes.net/groups (linked from a button at the bottom of the home page's sidebar)
First, here are the new groups:
New top-level groups (everyone auto-subscribed)
New sub-groups (auto-subscribed only if you were subscribed to the parent group)
Some of this will be a little experimental and I'm not totally sure how it's going to work out (splitting ~science into the branches of science especially), but we'll see what happens. The names and such aren't necessarily 100% final either.
Since we now have some real sub-groups that people other than me can post in, I made a small behavior change to how sub-groups work until those larger changes are ready. Previously, subscribing to a group would automatically include all posts from its sub-groups in your home page as well. That is, if you subscribed to ~tildes, you would also see all posts from ~tildes.official, regardless of whether you subscribed to it or not.
Now, your home page will only include posts from groups (and sub-groups) that you are specifically subscribed to. So if you want to see topics from ~games but not ~games.tabletop, you should subscribe to ~games and unsubscribe from ~games.tabletop. However, if you visit ~games directly, posts from ~games.tabletop will still be included in the list there, regardless of whether you're subscribed or not. I know this isn't ideal, but it's not permanent and should be fine for now.
I'm going to get back to working on updating these groups and moving some of the older topics around now, but let me know if you have any questions or thoughts.
And as usual, I've topped everyone's invites up to 10. You can get your invite links here: https://tildes.net/invite