Config changes on a G/A are a complete waste of time...until thrust increase has been verified..... because if you don't have a thrust increase, config changes won't do anything for you.
In a 3 second period, apparently, this crew raised the flaps, took and acknowledged a clearance and raised the gear.... but for 12 seconds, T/L's stayed in idle.
Has anyone tried to do a G/A in the sim with gear and full flap....just to see if this aircraft will do it? Just to give confidence that a 3 second delay in a config change to verify thrust, will not hugely affect INITIAL G/A performance with gear and flap?
I know SFA about the 777. Is there a multiple failure scenario where you have to manually extend the gear (so no retraction...Hyd failure??)... and perhaps don't select full flap till committed to the landing because of half flap speed or no flap retract (elec/hyd fault??) in case of G/A.... But then you have to G/A anyway... due to say, runway incursion, RAAS etc etc. Knowing the capability of the aircraft will help in times of abnormal situations.
Knowing if Mr RR or Mr GE will give you a better chance of a successful outcome compared to Mr Dowty's brakes or a drag reduction is knowledge that will save lives.