Quote Originally Posted by Remarus View Post
Cosmic Exploration is wholly removed from the expansion's narrative and so far has been nothing but Endwalker callbacks, to the point where the quest intro and complete themes are even EWs.
Cosmic Exploration can be started the moment you complete Endwalker, the final 6.0 quest, and is considered an Endwalker quest. Similarly, Ishgardian Restoration is accessible upon completing Litany of Peace, the final 3.3 quest, and plays the Heavensward quest theme because it's considered a Heavensward quest even though it was released in Shadowbringers.