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Banned
This isn't true at all. India was invaded repeatedly throughout history, and major empires (the Delhi sultanates, the Mughals) originated from relatively recent conquerors.
It happened, I said it was easy to defend, not impossible to conquer. I'm aware of the Mughals and the Delhi Sultanates. But it isn't like Persia regularly invaded India with any great success. Beyond the Mughals, I can think of the Indo-Scythians, Indo-Greeks, and the aborted invasions of Alexander coming through the Kush. In the end, they had to either give up ownership or control their Indian possessions, or their non-Indian possessions. Hell, the Delhi Sultanates you speak of are an example that even the Rashidun and Ummayads couldn't invade and KEEP India, and they were colossal.
Hell, it was only those powers that centred themselves in India that flourished, e.g. The Delhi Sultanates, and the Mughals.
Perhaps I should have used "easier", but the Hindu Kush is much more defensible than the Ordos.
My point was that if you compare the natural borders of the two, Indias are much more impressive than Chinas (with the exception of the Taklamakan Desert and associated corridor) which means that neighbors can pounce on weaknesses more easily (excluding Human factors).