I think we're really talking past each other - at least as someone reading this. As with many of the newer EPCOT projects, I think we have to be precise about concept vs. execution.
The concept of JoW works quite well, I would say. The inclusion of Moana feels like an afterthought/way to get it past the mandate. And, that pulls it a bit away from integrating more seamlessly into World Nature. But, how much that bothers someone is more personal.
The execution of JoW is a different story. The attraction itself is nice. It feels very lush and natural, and Moana actually works to translate that message. And (going back to concept), that works in the idea of World Nature. But, they stopped. As a physical space, JoW feels very disconnected from all of EPCOT. It backs up to the very circular, balanced hub. It feels disconnected (i.e. physically far) from the Land and Seas. It's entrance is down a lush pathway heavily planted - that then opens up in the old more walkway/intentionally landscaped areas of the former FWW.
This may be more an issue of World Nature vs. JoW itself. If they had heavily redone the walking areas and planting of World Nature to make it feel more lush/forest like (from Land to Seas to JoW), I think it would feel more integrated. But, they didn't (or at least haven't). It actually feels (i.e. looks) more akin to the new gardens/design of Celebration Gardens and its landscaping design than it does World Nature. And, that makes confused design in execution.
Same goes for the other side where World Celebration (IMAG) and World Nature (The Land) just switch. You could say the same about FL to TL in MK, but there are very distinct feelings on each side of that divide. I would argue The Land feels way more connected to and aligned with IMAG than JoW (because it was originally designed that way).
This is why it feels disconnected. Because having a thesis statement that doesn't actually translate visually or physically doesn't a theme make. It has to be executed in both concept AND execution.
EDIT: And, to be clear, this is coming from a fan of the attraction. I really enjoy it. But, I can also see how it creates issues in the land it allegedly resides in - and enjoying it doesn't override those.