Gnads,
Above I have pasted a bit from the Airbus VOL 2 re how to change a actual landing distance to the required landing distance. JAR states you need a required landing distance, except in the case of non-normal.
My point was that with most abnormals except the multiple failures, you now have a paradox where your RLD is less with the abnormal than without.
Which would help explain the common interpretation that airborne your RLD is your ALD with abnormal factors. Or pragmatically, that some French Test Pilot without system failures, slammed the a/c onto the piano keys to determine your ALD figure- which you conservatively address.