I am very familiar with both 787 and 777 aircraft and still fly both which is why I highlighted the additional features of TAPS/TAMS which the 777 does not have.
We are not in disagreement with performance. It is marginal but many turboprops are a lot worse. At least the 787 does not have a TAC that drops out with severe engine damage as per the 777.
I'll suggest again...do you have the "SHOW FULL OPTION" on your OPT ? If you do then you have acceptable means of compliance to manual increase thrust to that level where ATM is cancelled but the Derate thrust setting is not exceeded. That is the solution given from Boeing
My only query is how on earth Boeing FCTM comes up with typical engine out pitch guidance of 12 degrees (2 to 3 degrees less than normal) for initial setting. Anything more than about 8 and its good bye V2 for the 787 and similarly 10 for the 777