>>512964169
Conquest is about the land and sea and what they can do, the people never matter. Right now China-Pakistan basically contains India to South Asia, so Kashmir being held by Pakistan is a serious point of balance in the world.
Taking Kashmir would sever the land border between China and Pakistan which would weaken both Pakistan and China. It would disrupt Pakistani weapons and trade from China while also disrupting Chinese plans to a corridor to the middle east. It would also give indians a land border to Afghanistan with which they could increase their own competition over influence in the middle east and central Asia.