problem with most Lexus in the snow is not just RWD but very very sharp throttle response which leads to :
1) traction control on, touch accelerator , wheel spins, power cuts....go nowhere
or
2) traction control off, touch accelerator , wheel spins....go nowhere :)
I have driven IS, GS, LS, RX and best of the RWD was LS because it had very long throw throttle with gentle action. The IS was bad, the GS was comical....