Ah, OK. I think I'm following. So in your definition AWD is:
- Center diff of some kind that is always sending power to front and rear through either a viscous or torsen or computer-controlled (e.g Haldex) system
- front and rear axles must have limited slip? Or, is it enough that if they are open diffs that they have brake/abs driven systems that will brake the slipping wheel and drive power to the other wheel on that axle? This is super common. It's what VW, Audi, Subaru and I think even our 4runners use if they don't have a true mechanical limited slip? Again, we're probably splitting hairs but even "axles" without a true clutch or torsen limited slip can approximate it pretty well with the single-wheel-braking system that many use.
Regardless: One of the key reasons I went from an ORP to a Limited was the full time AWD (or whatever you want to call it). For my use case (YMMV), I spend a decent amount of time driving at speed in hard rain, scattered icy conditions, some snow/slush. Along with some driving on grass slopes. The ORP frankly sucked at this compared by my previous GX470. No, I'm not going to look ahead, see the hydroplaning risk, or the ice, and shift into 4wd. Nor did I want to shift into 4wd any time I was on a grassy slope, or a launching ramp. I just want the truck to have great traction all the time. To be a freight train in these conditions (of course with the right tires). The Limited does this. As did the GX, and as have a few of our old Audis. The feeling of control with these Torsen systems is really amazing. FWIW it's far better than any viscous/computer-controlled AWD setup I've owned. Including Subaru, our Macan, our old Honda Pilot. The "sense slip then react" can be really unnerving in some situations. The Torsen applies torque to both axles *all the time*.
