"Without knowing the 777 in detail,"
That pretty much covers your input to the FLCH discussion on the 777 or any Boeing for that matter. Thanks for playing.
Any pilot using FLCH in a 757/767/777/737 on final approach is an abject fool.
A trap? If that is a trap then so is walking into traffic and getting run over in front of the terminal. Some people need to find another line of work.