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I like what you are saying, especially since you have good steering references in the E9Xs for my preferences and that you have experience with the F30 and can feel a significant improvement.
However, having owned an F10 rwd with EPS I can say that precision was not the problem. It was numbness, inconsistent boost, weak return to center force, vague on center feel, artificial and overboosted feel. Quite a list to address. I also recently drove a slew of 2014 6 series cars ( GC, Coupe, Vert ) some with X-Drive, some with RWD on and off track. On the track the precision is welcome and the numbness is not too bad when pushing the car to the limits. It works fine. On the road I drove a new 640 GC, it was, well terrible. Worst in Sport mode where it was artifically heavy and very numb. It is true however that the X-drive models with HPS are not that much better so it's more than the PS, it's likely also the rack in itself and suspension that is not very communicative + the type of servotronic system used.
It seems BMW has realized that this will not do for the M3 since they have developed a new unique EPS system with ZF. I think it will be very good. I also know I need to try it myself since I've heard others saying the the 6 GC has wonderful steering so it's quite a subjective matter.
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