Yes I think the company Rare are still developing Sea of Thieves. There is little on the islands, at present, and I guess they'll begin to inhabit them with interesting creatures (or worse). There aren't enough enemies with enough types of threat. Perhaps the goal of getting the treasure back home safely isn't enough.
Perhaps Rare will add tasks on the way that have to be completed, against various odds. It may be that the downside of large groups setting upon small and stopping their play will be fixed. I think all games at all times can be improved in some ways.