The Bible update at the top of the web page looks decent. I think it is well implemented. The whole idea is about visibility and convenience, so one can spot their favourite threadcast without having to stroll through the timeline or ask for links.
Aside linking up with X spaces, I think this would go while for live events like football matches or web 3 events like hivefest. I for see many web 3 companies that are onboard here to use this feature.
It would be nice if the timeframe for a threadcast is adjustable. Certain thread casts would last longer than 12 hours. For instance, one on a live event like Hivesfest that lasts for a week or so. People should be able to join the conversation/event via threads at any given time.