"After reading the incident report, I learned that the TCAS had wanted the descender to increase descent and the climber to increase climb, something I didn't realise TCAS would do (cross levels). I now know a lot more. "
I think that goes for all of us, Ferris. If anything good can come out of this dreadful accident, let us hope that at least it is a vastly improved understanding of the way TCAS can work, and if what we read is true, some international standardisation on reaction to RAs.