Wonder if there's some confusion between simulation and visualisation? None of the FDR downloading/analysis tools I've used is particularly user-friendly - and even if you're used to looking at graphs of parameters it can still be hard to see exactly what's been recorded and hence what was going on.
The Flight Sim-type visualisation tools as used by CASB & NTSB do aid comprehension as to what happened and thus the overall management task. As far as actual use of a simulator, I'm in agreeement with M(F)S - even reflying the scenario in a real aircraft is doubtful as factors like crew experience, weather, and even minor system differences can have big influences on the eventual outcome plus, of course, we don't want to add to the casualty list.