Eureka is a big part of what made Stormblood great, along with the trials and raids and story.
Bozja and Ishgard Restoration is a big part of what made Shadowbringers great, along with the trials and raids and story.
??? is a big part of what made Endwalker great, along with the trials and raids and story.

That's kinda the problem with not having a relic zone. Island Sanctuary and V&C haven't really made up for it in the sort of large scale social experience that the other examples had. Island Sanctuary is solo content and V&C is either solo or 4-person content.