Actually, Pathfinders have a 4WD mode where all four are locked together. But in practical application, like purposely trying to get it stuck, there wasn't any real difference between its 4WD and AWD modes as far as tractive force. And, in 4WD, with the wheels all locked together, the magic stability control features didn't work (they require being able to brake and power individual wheels). And it would switch off about 20mph (as I recall) anyway.
4WD was one of our factors way back when when choosing PF or JX. But after having had 4WD, I don't miss it on the QX.