As chronicled in your researcher's journal as I researched my history of early lifestyles in South Asia...
I would recommend anyone who really wants to research South Asian history to go directly to primary sources, or at least to secondary sources that handle them carefully.
Overgeneralizations I have seen even in some academic/scholarly secondary sources hide the truth, that history is fascinatingly complicated and varied. (The same problem happens with many pre-college history classes.) I heard something similar pointed out by an archaeologist and historian who works in Williamsburg, Virginia -- she said that people had been repeating the same myths about what people ate in colonial America, but when you look at the actual archaeological and archival evidence the picture is ever so much more interesting. It's not just a problem in South Asia!
Current time travel apparatus location: Williamsburg, Virginia, USA