This is a strawman argument and not a particularly clever one. Most people weren't expecting Animal Crossing, Stardew Valley, or a replacement for housing. At first, nobody really knew what to expect because the devs were radio silent for so long about hard details (which should have been a big red flag for people). Using "dont get your hopes up" as your big pitch is also a red flag.
When people do mention those games, its in the context of "this is what makes those games fun, and Island Sanctuaries doesn't have that, so what does it have?" with the sad obvious answer quickly materializing as "not much".
Rewards: they offer two hairstyles as rewards and they BOTH have to be ponytails? Like...really?
Thematics: the mammets are obnoxious and unwanted. I feel like I'm running a clone factory. Why exactly do I have to pay them in shells? What do they do with them? Somehow a relaxing paradise turns *very* quickly into an offshore labor camp mass-producing cheap items for sale in Limsa. Just a strange design choice. I guess I have to give the mammets rest days so that I don't have to construct nets in the stairwells.
Does anybody regularly visit other people's islands? Why would you? Theirs will look almost the same as yours because there's very little ability for customization at all. Some of the buildings that have second stories don't...have stairs. They have nonfunctional ladders.
Just a lot of weird design choices, and all I'm left thinking is: I wish they'd just focused whatever effort they spent on this on expanding the functionality of apartments. That would have been so much better for the game and the communities.