You are equating a alien group that refused to mix for 1300 years to national homogeneity premised on racial mixing on the twilight zone between tow distinct racial and theological and linguistic civilizations?
Huge stretch.
We mixed because we had to.
A huge chunk of Pakistan considers itself of different blood and culture and tongue.
They got cobbled together under Islam in the rush of the Brit departure.
Even so, a big chunk never agreed and kept and keep fighting the state.
The other big chunk is claimed by the warring Iranics next door who consider your state as squatters in their land. Refusing to have anything to do with daal eating Indica across the river you love.
Your only shared identity is Islam.
And half of you share that and blood with us, the other half share that and blood with Iran.
Best of luck.
Cheers, Doc