Concur!
I remember the Volvo-Subaru muddy hill climb videos - Subarus with the central diff with limited slip clutches ruled, while the haldex-assisted Volvos made a mess. Clearly a locked mechanical system is more effective in off-road or pavement-extreme situations. But for general wet and snowy pavement, rear-wheel assist is still helpful.
We had a gen-1 MDX with their torque-vectoring AWD. You could “lock” the rear differential. I serviced it a couple of times. To my surprise, the factory required “lock” was up to something like 145 ft/lbs per side. The diff was basically a spool with e-magnetic clutches on each half shaft. It only needed 6amps per side, which got me to wondering just how much it could lock. That equates to a total of 290 ft/pounds max torque at the rear. If the radius of the tire was what, 15 inches? That equated to a walloping 240 lbs or so of thrust against a 4200 lb vehicle.
Driving it around in the dirt, it was not very helpful. Driving it around in the snow, the vehicle was quite good. It surprised me how little power the rear could provide, and yet how helpful it was in the fluffy stuff.