Let's assume Babar-Rizwan is their trusted opening combination.
That's fine as they've spent lots of time developing their chemistry and have been somewhat successful. It is what it is.
But your tactics for the rest of the batting lineup have to be spot on. This includes the deployment and in-game strategy for batsmen 3-11.
Good coaching can maximize this batting order with the right approach. This includes reading the game and making the rest of the lineup versatile and interchangeable.
For example, today's match Babar got out 97-1 with 8 overs left. This is the perfect time to put in one of your attacking options rather than Shan Masood. Even Khushdil makes more sense if you believe he's one of the team's attacking batsmen.
Then after making their first tactical mistake, they send Khushdil with a few balls left when Asif Ali is known for being the best six hitter in the team from ball one.
These coaching mistakes cost them 15-20 runs.
The middle order batsmen are already limited and now their main skills are not even being used. That's just poor.
If the opening pair isn't aggressive, you can't make these mistakes in the WC and they've been making them for a long time. It's not just this match and it's become a pattern with how they use their batsmen.
Babar also does the same thing on the field with his bowling deployment. That's harder to fix when the coach doesn't even know how to manage the batting order.