Edward, it depends on which Innov8 I guess as some of them are pretty light. I have experience with the 370 and 390 GTX, so I can only speak to those.
Since I also hike in the Namche at times I can give you an objective comparison. As you already know, the Namche has a fairly ridged sole with little flex except at the forefoot, and even that part is somewhat stiff. When I first started wearing them I was immediately sold, primarily because they performed in many respects like my vibram & leather hiking boots (good support, protection from sharp rocks) except that they were lighter and breathed better, which resulted in drier feet and thus fewer blisters. I thought man-o-man this is it! No more looking for a shoe that my feet like! Then I discovered a downside. The tread is unusual in that probably 50% of it is comprised of lateral bars, something I initially didn't give a second thought to at first. But after having my feet go out from under me SIDEWAYS, twice, which has never happened to me before with any other boot in decades of hiking, I would counsel others not to use these boots on solo, x-country excursions. However, they are great for rough trail use if you like that old school boot feel.
Enter the Innov8. At first I didn't know what to make of them...them seemed flimsy. Maybe even poorly made. Well, I'll give 'em a try I thought. It was like going barefoot or wearing moccasins...I could really feel the trail, but to my surprise, without feeling sharp stones poking through. The sole looks thin but really is tough (though in all fairness I recall reading about someone experiencing a delamination problem). And you won't have to suffer the shock of having your feet go out from under you sideways. The lugs on these boots are more like the traditional waffel stomper design and really grip.
But back to the moccasin-like feel of these shoes. They are so different that you can adapt a new style of walking from that require by a stiff boot. A stiff boot, by virtue of its construction, requires that you lumber along with heel strikes as the main defining action of walking, almost like goose steeping. In contrast, with a moccasin you can employ what Bob Wood in his book called the "Indian step": a style of walking long used by cross-country skiers, gymansts and, of course, Indians. It is a much more efficient way of travel...fast and light!
Anyways, to answer your question, yes, in my considerable use of these shoes both off trail and rough trail, they are adequate to the task and better than some.