There is no stress, pressure etc involved in present-day Indo Pak matches. These factors only come into play when teams are equally matched and whoever handles pressure well pulls the balance to their side.
In this case, its a case of difference in skill/talent/abilities whatever you want to call it. What you saw today was the best they had to offer. There are no significant selection issues, no batting order blunders etc. Those are finer details. The problem is much more deeper than that. Its just the difference in talent.
I completely agree with Rashid Latif today in post-match analysis. He said even if complete 15-men Pakistan squad was playing against India, they would have still lost.