The problem with facing an attack like Pakistan is simply that there absolutely is no let up to the bowling attack. You have five bowlers all of whom are gunning for wickets from the word go and when your players have such an insane hunger of blowing the opposition away, even if two or one of them click in any given day - You'd essentially win the match.
Sky sports after the CT win did a complete analysis on why this bowling attack is as vicious as it is and all of them came to the same conclusion (A panel consisting of Ian Ward, Mike Atherthon, Nasser Hussain) that since all bowlers are looking for wickets no matter how minscule the target is Sarfraz as a captain will always stay in the game.
Of course such an ultra aggressive bowling approach could totally backfire on the odd day (1st CT game) but on the whole it seems quite a sound strategy and in sync with how Pakistan have historically played their cricket. Here's what we play first hand
Amir (World Freaking Class, Swing, Pace, Seam, Reverse, Yorkers, Bouncers, Bowling Dry ~ You name it)
Junaid (Death Over Specialist, County Regular, 3rd Highest Wkt Taker in CT, Reverse Swing, Yorkers)
Hassan (Best LOI pacer in the World; by some stretch, Reverse Swing, Yorkers, Pace)
Shadab (Best LOI Spinner in the World at the moment, 18 years, Gun Fielder, Proper Batsman as well)
Imad (#1 T20 ranked bowler, killer economy, Took care of Amla and AB in back to back deliveries, Shadab and him are probably neck and neck when it comes to crunch situations)
Our 4th Change is Hafeez who would literally walk into other LOI teams as a bowler alone, many times Sarfraz doesn't even asks him to bowl in a match

And I haven't even gotten to Malik yet.... and just for to top it all off we don't even play Ruman in our first XI
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Now compare and find me any other cricketing nation that has this much depth in their Limiter Overs bowling as what I've written above ~ you'd get the answer for the OP.