Like other pilots here have commented, I find MS FS much harder to fly properely than a real aircraft. The lack of perihial vision and the tiny size of the instruments which are the only way to fly it.
I can't comment on the add-ons adding 'reaslism' with regard to B757/767 or Airbus FMS etc as I have only tried FS 95 (pretty basic) and I am not Type-rated on either type!
Howver, I would think that the comments about V-speeds etc are not really relavent to this. Why do did they need to know V2, etc? I would think however that to fly a B757 into a realitively narrow building at high speed would take a fair amount of skill or familiarity with the handling charateristics of the type. I'm not sure I could fly it that accuately (1100 hours TT, CPL/IR etc but all so far on smaller aircraft) without pratice on a proper sim. This must have been what they did.