I think maybe your comments are a little harsh. We all see questions posed on this forum such as yours and one immedeately wonders what is happening in your own training organization that this definitive information is not available to the flight crew?
BTW, the 787 does not have a TAC for what it's worth and consequently Boeing is teaching most if not all EO procedures with the TAC on in the B777 with an eye towards a common type rating in the US.