I think I prefer how Claude Duet does threads over Grok Bot's single conversations. If you want simultaneous workstreams with @bot you have to create multiple bots. With Duet you can have one dedicated "channel" for an area and orchestrate many simultaneous threads.
Seems like it should have been obvious to me by now but smaller PRs are so much easier to deal with, and the new Stacks feature on GitHub makes managing them when chained together a breeze.