Exactly!!
So far they've only cooked Punjabi, Rajasthani, Gujarati and Malyali (Kerala) cuisine.
As far as international is concerned we've only seen Italian.
There's so much more to indian cuisine - Kashmiri, sindhi, North east, Goan, Bengali - each so different from the other.
I understand all participants don't have exposure to international cuisine but chinese is pretty common in India and I haven't seen that either.
Atleast from contestants with exposure I'd have liked seeing some international elements - Middle Eastern (though we did get hummus), Mexican (quesadillas were tried), thai, japanese.
The above listed international cuisines are now popular and easily available in metro cities in India. Don't know why they haven't been used.