I'm not sure what further modelling of VRS will achieve - its existence is well documented and we know that avoiding flight regimes where low IAS is coupled with allowing a significant RoD and application of power will keep us clear of it.
Maybe pilot training isn't what it was or newer pilots have been spoiled with such powerful and capable helicopters compared to 50 years ago but of all the very many helicopter pilots I know or have flown with, few have experienced LTE and even fewer (probably 2 or 3) have experienced VRS.
Maybe it is a function of the modern generation that they can't accept what they have been told by the old guys, they have to find out for themselves and won't be happy until there is a VRS or LTE App for their I-phones to keep them out of trouble.