As long as your on a dirt road,it isnt off road. Guys have done the haul road in AK on Gold Wings and RT's.
They probably know how to ride gravel though. It really depends on a guy's experience as to how good a Big Twin ADV bike works out in the dirt. There is no stage presence involved in riding a simple 650/400 down a gnarly jeep trail.
Doing the same road on a fully loaded 1200GS with slick Tourance style tires is much more of a challenge,I dont know how people pick em up off the ground but they do.
Some bikes around at times