From the persons that know....
"CAD loves NATS coz they can manipulate them.
Top brass badgers the hi tech kid into changing his retired consultants recommendations.
Spinning whatever the CAD wants to hear and tell Bureau.
NATS is no longer considered world's best practice. Just adept at churning out endless reports with what CAD officers already knew. Sounds better if it comes from an "expert" of course."
Too much secrecies in CAD now. Unhelthy situation. Lot of whispering going on.