I've pretty much always matched my front\rear to terrain, the rear knobbed tires squirm on the road.
I'm more speaking to the set that doesn't have 2 wheelsets, or bikes.
I can flip the rear tire if i'm going deep or it's monsoon season.

We have many trees here, a front treaded tire is good urban for the wet leaves, and the point is it's not really the rolling resistance tire ,the steering tire so I'm staying big and toothy front.

I'm digging the combo -and offroad (light) not too bad. I pump the rear back up and get home fast.