India? Screw that poo. That place had little to no interaction with Europe and the ME (apart from the trade routes that aren't even simulated) in the period. Of all the things they could do to make a game about the crusades, heresies, knights and peasants more interesting they simply expand the map to encompass more territory without any historical relevance.
Then again, after the Aztecs I was constantly worried they would just say screw it and throw all pretense into the wind.
You have no idea how wrong you are...
Seriously, it hurts.
No interaction? Quite the opposite, tremendous interaction. Islamic traders and invasions both maritime and overland. Cultural exchanges. And the simple fact pressure from Indian Powers changes how the Islamic powers have to act.
You call for historical relevance? Gaining a new part of the world that had any real effect at all, even just ripples, is a tremendous boon to realism.