I think the impetus behind the design was to remove the T/R compensator as there had been so many C0*kups with it in the B3 that has it.
HYD Failure and pressing the HYD TEST which dumps the accumulator compensator which brings on a new world of hurt for instance.
Operators seem to mistake the HYD TEST for HYD OFF. Once pressed you cannot get it back.
The pedal pressure at low speed will lift you out of the seat and you will lose control of the aircraft.
Read
here.