Lets take a quick look at the EVACUATION NNC evolution in our Airline.
Formerly, the Captain and FO had individual recalls to complete once the Captain had decided an evacuation was necessary and called for the Passenger Evacuation recalls. At the completion of the recalls the Captain called for the Passenger Evacuation NNC, which the FO dutifully read from the QRH. Then the pilots joined the passengers and cabin crew outside in the darkness.
With the new EVACUATION NNC, once the Captain has made the decision to evacuate he/she calls for the Evacuation checklist which is read by the FO and actioned by the Captain as his/her area of responsibility. The Evacuation NNC is on the back cover of the QRH hence very easy to extract and read. Once the checklist is read and actioned the pilots join the passengers outside in the darkness.
Having used both methods in the simulator recently, the new method does flow well and probably takes LESS time to action.
Do not fear the unknown, we hope changes have been made by Boeing for good reason. It appears to make sense once you have tryed it a few times.