A V8...???
What the RX needs is a smaller engine, say a 2.3L I4, but with a supercharger that doesn't supply boost unless the accelerator pedal is beyond 2/3's or the engine ECU recogizes a FAST accelerator pedal depression.
V8 engines should go the way of the DoDo bird and V6's should follow shortly thereafter.
RX should have a range of options so that any consumer can pick an option that is right for them. Some of us actually care about performance and as a Porsche owner, I would expect you to understand as much. I guess 911's should be replaced with 2.3L I4 as well according to your logic