Hi ,
I'll maintain that "Beyond the glide slope", is just a measurement of the distance from the antenna to the end of the runway (landing roll available, so to speak).
Correct.
Steeper glide and upslope you pass the threshold higher, but still touchdown 300 meter down the runway (assuming no flare).
Not so, other wise all the above quoted examples would have a difference of 300m between the published LDA and the "Beyond the glide slope difference".
Please see
MRS.pdf for Runway 31R. The difference between LDA and "Beyond the glide slope" is only 262m. (Due crossing the threshold at 50 feet but on 4 deg glide slope)
There is a spread from 262m (MRS 31R) to 344m (CDG 27L) of 82m.
The point I am trying to make (unsuccessfully it appears) is that our performance calculations are based on LDA, but the "landing roll available" (for braking etc.) can differ by around 82m from the LDAs published for different Runways.