1. Optimize CX: 
NPS tracked across the customer journey highlights the areas which are not valued by customers (which otherwise you thought was valuable). Hence, understanding the drivers of NPS, from customer perspective, helps in prioritizing the CX and hence optimize cost.
2. Overall Health Check:
NPS mapped across the customer journey helps organizations get a bird’s eye view of their entire operation.This helps to compare performance of processes and understand which process could be the weakest link.
3. Touchpoint specific feedback:
NPS mapped across the journey will highlight challenges specific to each step of the customer lifecycle. With techniques such as advanced text analytics, it is possible to get to the root of specific problems at each stage quickly.
4. Quicker Close Looping:
If there is a problem with a specific process, NPS mapped across the customer journey helps to close loop it faster without delay or impacting other processes. 
5. Bridge gaps between different department:
NPS across the customer journey helps to bridge any gap between these departments and strengthen synergies.