Yes. The plan is for Matrix to support both arbitrarily deep threading (like https://matrix.org/blog/2020/12/18/introducing-cerulean https://matrix.org/blog/202

Yes. The plan is for Matrix to support both arbitrarily deep threading (like https://matrix.org/blog/2020/12/18/introducing-cerulean https://matrix.org/blog/2020/12/18/introducing-cerulean does) - as well as Slack/Discord style threading. They have very different semantics; we added Slack style threading to Element first for familiarity and bridging with Slack, but I can’t wait for fully branchy threads to be in production too for bridging to Zulip (or HN ;P)