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Pros:
fucking massive
lots of variety in environments and local cultures even without making major changes
Lots of history to play with
Bad:
The central plains are boring and would also almost certainly be where most of the region is settled because of history and population density
They will almost certainly half-ass anything west of Xi'an if they even include it at all
India would unironically be a better choice whether or not they put a lot of effort into it