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@Dammit
The latest models do, the AWD system for the P1 cars (before Ford, basically) and the early P2's (first gen V70) use a viscous coupling to send drive to the rear wheels.
In a sense it is torque sensing- but it's fairly crude.
The viscous coupler locks up when there is a speed differential between the two shafts- i.e. one or both of the front wheels are spinning.
So it's a "slip then grip" system.
The coupler itself is fairly robust, however the angle gear that takes drive from the gearbox and directs it to the viscous coupler is notoriously weak.
The M56 box (open diff as standard, can have Quaife or Gripper fitted) can take 700+ horsepower.
The M58 (AWD) box's angle gear is generally guaranteed to have failed in use by 100,000 miles on the standard cars- with 170bhp at the crank.
These cars are crying out for a proper centre diff, and stronger angle/bevel gear, giving full time 4WD and a trans robust enough to deliver the power without grenading.