The map

[Ludens]

Because it would require them to cross through either a steppe or the Himalayas, which would be nigh on impossible for an army. Not to mention that there is a limited number of faction slots, unit slots and city slots, for all of which EB is already at the limit, so including China would mean dropping stuff that has already been including. Or that researching the Chinese military as thoroughly as the rest of EB has been researched would take months and require the team to bring on new experts.

I'd like to see China as well, but if they were to be done justice, they'd need their own mod.