@bastianallgeier I remember when twitter changed replies -- before, me following @ foo meant that I saw everything that foo posted, reply or not. At the beginning there wasn't a thread structure at all, just a stream of unconnected tweets!
Then twitter made it so if you clicked reply to a specific tweet, it was linked in (you could have a thread), and then twitter made it so if foo replied to a tweet by baz, *I DIDN'T SEE IT IN MY TIMELINE* **GASP** -- I could still read the thread, but I didn't see the reply tweet by default.
Folks were *pissed* about this change and missing updates to the discussion.
We even had a revolt, people petitioning to #fixreplies to put the behavior back to the old way.
Which led to the tagline a few years later,
"Remember #fixreplies? We were such dorks back then."