This is awesome! I was literally just thinking about this yesterday.

Do you feel like this will diminish Bluesky in any way? I wonder if having 2 models for interaction (twitter style + thread style) will muddy the waters at all? It does sound like they're doing their best to make the hybrid work "You don't always have to visit a community's homepage to get the latest posts, though. They will automatically appear either on your Discover feed or a special feed for them".

Do you think Twitter / X should also do this?

I think Bluesky is struggling with user numbers and cannibalizing the ecosystem, leaving little room for other teams to have an opportunity. Leadership over there is the primary reason I left atproto

X has something called Communities, not very compelling at the moment.