In google docs all editors work on the same live instance of the document and changes are applied instantaneously. In Team Project every editor works in their own local sandbox, changes are merged with the head/master revision once a user shares changes. Other collaborators are then able to 'Get Latest changes' to see the shared changes. Sharing and getting latest changes are actively initiated by user.
Edits to a sequence/timeline should definitely be shared.
Following help document explains the ‘sharing workflow’:
Feel free to contact me directly in case the help document doesn’t answer your question or you still have problems sharing changes with your friend.