Again much of this seems contradictory or illogical to a pilot.
It shouldn't be so if they are trained appropriately. I doubt that any of the line and supervisory pilots I have trained and signed off over the years had any problems with the material (to an appropriate level).
If memory serves me well FAR 25 covers certification from the perspective we are discussing.
Indeed .. FAR 25 is all about certification.
A small sample of these are the effect of a headwind is halved but for a tailwind is doubled.
Are you sure about that ? Perhaps you might just recheck that statement and provide a correction to it ?
The brake pads used are worn down by 80% (only 20% remaining).
Are you sure about that ? Some authoritative references would be nice to see.
Most manufacturers treat this information as proprietary and confidential
All OEMs treat just about everything as super top secret .. money rules.
.. and then we shall await your Vmcg answers and commentary with bated breath ..