I think its related to diet as well as genes.
Pakistanis are generally stronger and taller than indians.
The absence of a fast bowling legend is also one of the reason.
I don't buy the"pakistan doesn't produce good batsman " saying, atleast they have atgs like javed, younis, inzi, yousuf, what we have Zaheer khan. LOL.
But VIRAT KOHLI has changed the way we looked at pacers, now pacers are our strike bowlers not spinners. Our pace bowling stocks are better than ever and currently we have a better pace unit than pakistan.
Shami, bumrah, the new and improved Ishant sharma, bhuvi,

w this is a solid bowling unit in tests.