@epriestley: That's an awesome change, but now the list of subscribers is way more prominent than the assignee. Wouldn't it make more sense to put assignee (which is more important information IMO) before the list of subscribers?
Just a suggestion! Thanks for your awesome work 👍

My theory at one point was that the lowest position is more visible (i.e., easier to locate visually -- since you know it's at the bottom, and the bottom of the curtain is visually distinct) than positions in the middle of the curtain (which don't have a well-known position), even if they're higher on screen. So that's why "Assigned/Authored" are currently at the bottom. However, feedback doesn't necessarily seem to align well with this theory (several other users have also suggested that they'd prefer this UI use "higher = more important" ordering).

I think I'm likely to try to apply a similar treatment to "Tags" and then maybe move "Assigned To" and "Authored By" to the topmost positions, directly under the actions.

There's a vague technical issue that I don't have an extensibility pattern I'm thrilled about for lists like this. Some of the elements are provided by modules from other applications (subscribers, tags); others are provided by the application itself (authored by). Today, each module assigns each curtain element a numerical sort order. This is sort of fragile; it also means modules can not override order or reorder elements. A possible fix is to make the order configurable so it doesn't really matter what modules do. I'm not thrilled about this for other reasons, but it's cleaner than any technical ordering pattern I've come up with.