I wonder if Afghanistan and India might work together to beat down Pakistan.
Although this is denied in Dave Holmes’ and Norm Dixon’s 2003
Behind the US War on Afghanistan, it has occurred to me that if Pakistani Baluchistan was part of Afghanistan, the
USSR might have invested much more in trying to ally with and aid Kabul. Even before the Afghan monarchy was overthrown, there were strong ties with the USSR, in part because so many Central Asian ethnic groups lived on both sides of the border. The prospect of influence in the Middle East and South Asia would have given Moscow further incentive to involve in Afghanistan.
It is true that such a move might involve a stronger USSR alliance with India, but I do not view that as critical.