Rider forward ergonomics was the industry's response to consumer demand, and like everything else, there is a point of diminishing returns with this design.
In my mind, asking if sleds should be "more rider forward" ignores what that was supposed to enable in the first place. Namely, allowing the rider to more effectively raise the CoG with his/her own body, and to increase leverage over the skis for more maneuverability.
I agree with geo and LoudHandle in that every chassis design has a sweetspot with regard to balance. If the ergos of a sled force the rider too far forward then that places more weight on the skis which necessitates altering the skid dynamics to maintain balance.
Every sled has a natural rider position--that spot where you feel most comfortable. I want a sled that puts my natural, intuitive, most comfortable position as close to rider neutral as possible. I want to easily optimize the sled's maneuverability range by adjusting my position forward or back, left or right.