Island Sanctuary feels intentionally slow and inefficient.

[RoroCookies]

It’s honestly just okay content. Nothing amazing and nothing too bad either. My only issue is that it feels pointless to make any monuments or whatever they are. While those are cool they don’t really add anything important to the island or change anything.
I guess I could invite friends over to see where I placed my bathhouse but why even bother with that. Buildings that don’t provide any income should be more. A simple a buff or increase from them would be nice. Doesn’t even need to be that exactly, could be something as silly as unlocking unique gposes or emotes for your character interacting with the land mark. Literally anything than it existing.

[Absurdity]

My only issue is that it feels pointless to make any monuments or whatever they are. While those are cool they don’t really add anything important to the island or change anything.

They absolutely do something. But as always with this game it is unreasonably vague about what they do.
Landmarks increase your maximum Groove. Groove is a buff in your workshop menu that gets higher the more things you sell consecutively in your workshop and it increases how much Seafarer's Cowrie you gain from it, 1 point of Groove = 1% more currency gained from sales.