Ask a Sea of Thieves player for complaints and they'll likely have one common theme: there's not enough to do. You can only dig up so many treasures on the same islands. And Rare knows it. The developer has detailed content plans for the first several months after launch, including a shift in priorities. While Rare had talked about adding pets and ship captaincy early on, those features are "on the back burner" as the company focuses on adding more raw gameplay, including maps, enemies and events.
Source: Sea of Thieves