Couldn't this entire slanging match been avoided by just one poster pointing out that, as 99% of airlines use Reduced Thrust for Takeoff :-
(1) If the full length had been used, the thrust reduction would have been MUCH greater, emulating a Field/Obstacle limitation, and
(2) As a reduced length was used, the thrust reduction would have been MUCH less, emulating
THE SAME Field/Obstacle limitation.
In short, either of the Takeoff choices would have been operating to the same safety tolerances.
Sometimes.......................
Regards,
Old Smokey