Honestly it feels just like a waste of time and energy for the northeast part to be part of India. Unlike minority regions in China, they didn't have hundreds of years worth of interaction and exchange since they were literally separate entities and far away. There's no asking the Tibet leaders to go to the capital in Beijing as part of the process equivalent. That's why they are so different both genetically and culturely. There just is no connection apart from the Brits lobbed them all together.This is necessarily a result of Akhand Bharat.
If you want to be a pole in the world you have to be able to sell a story of how you see the world works under your sphere of influence. This story has to provide benefits for other countries or else why should they sign up to your vision?
US has it's rule based order
Soviet Union had a socialist utopia after a world revolution
China has Community of Common Destiny
If India's story is Akhand Bharat, how does that benefit anyone not fitting into BJP hindu mold? I understand they need it to provide unifying force within their country, but it limits India's ability to become a pole in the multipolar world.
And instead of developing the impoverished parts, they just ignore it so those people will never even have a chance of reaching their full potential. Given how their most accomplished olympic weightlifter is from there despite being given little support, I really wonder just how many are being held back. I don't see India having any real intention of ever developing that area properly.
What I'm afraid of is if they ever decided they had enough and want to split, Chinese leadership will not help them saying it's none of their business. While it is an internal affair, I really don't see why they should be forced to be part of a country where they have no future.