How do you propose that it is engaged after 100% N1 was commanded ?
I leave the correct answer to someone type rated as I never flew the NG but if it’s anything like the older ones, arm the AT if it isn’t already, then choose from two taps on the TOGA switches, pressing the N1 button, LVL CHG, VNAV and probably some others.
My point was that if automation is available and would reduce the workload, thereby freeing up monitoring capability, it might be a good idea. It’s very possible that this accident wouldn’t have happened if the AP and/or AT had been engaged...