Island Sanctuary at Max Rank should give you something for Cosmic Exploration
If they are going to discontinue the Island Sanctuaries major updates, they should give you a reward for maxing it out, which could be used in the Cosmic Exploration.
Obviously, it wouldn't be anything that isn't cosmetic. Some thoughts on what it could be:
- Island Sanctuary inspired cosmetic skins for buildings.
- Unlocked Island Sanctuary landmarks for landmark spots.
- A small landmark thing in a unique spot separate from other landmarks, that could be toggled. Perhaps some kind of statue commemorating completion of the island sanctuary. It could also serve as a "trophy system" showing off various achievements from the game. Imagine if you could pick different statues displaying unique achievements.
I.e. Defeated an ultimate raid, so you get its statue in your statue spot. Completed Island Sanctuary. Completed the Bozja storyline. Beat Eurekas secret raid. Completed the Doman restoration. etc.
Things that are purely decorative, but would be an incentive to show off having your island sanctuary finished. ;3