It seems like there are two different versions of this park which we're discussing.
One is fully dedicated to ideas like myth. In this version, there is an entire UK land dedicated to Beastlie Creatures and Arthurian Myth, plus an entire separate Greek Myth land. All settings are inherently fantastical and require complete immersion.
Another idea is a "World Showcase meets Animal Kingdom" style exploration of the world's cultural and natural wonders. Myth remains an aspect of this park, however it is found exclusively within attractions. Exteriors reflect real world settings, with a transitional flow from nation to nation as was planned for WestCOT:
India, Thailand and Vietnam are visible at once but blended thoughtfully. Directly to the right you would transition into China, and then Japan afterwards.
I support this latter approach. IPs fit as needed within realistic exterior structures, plus there's plenty of opportunity for original creations everywhere...with nothing clashing! Perhaps seeing ****et and the Taj Mahal simultaneously isn't "immersive," but realistic detailing a-la DAK can make a charming setting nonetheless.