For team projects (but also for individual users) a "comment" area that does not depend on a specific segment (ie the contents is displayed regardless of the segment number) would be useful to exchange live (sync'ed) on specific issues regarding the project.
The comment would come with the name of the user, like in a "chat" interface and comments would be sync'ed as entered.
I'm seeing this interface as what they have in etherpad on the side. The pad would only link people connected to a project, it would not be hosted by a third party service.
The chat could be an IRC chat to a channel created just for the team with a semi-random name.
Matrix is good alternative for future standard communication platform.
https://hacks.mozilla.org/2018/10/dweb-decentralised-real-time-interoperable-communication-with-matrix/