Terrain ABOVE the Vabbian Corridor should NOT be blocked off from exploration.

Exactly what I said, since I can jump up to the top of the plateau that is above the Vabbian Corridor in the Desolation I should be able to explore it with my mounts, it wouldn't have to give you any of the PoI's or WP within the corridor, just allow you to wander around up there, heck if Anet wants to put enemies up there to make it interesting, but don't block it off from access.

you seem a little unhappy, but I do not think you're post will do much impact to their decisions. But I am sure that they enjoy the feedback.

Not unhappy, just pointing out that in this case the plateau above the Corridor shouldn't be blocked off from exploration, it gives you no advantage and characters could easily be prevented from going to Vabbi that why by having a higher set of cliffs you can't jump to, but the actual plateau above the corridor should be traversable in this case(I know there's many other areas that access is blocked from but before mounts and gliding you couldn't reach them, it's the invisible wall syndrome.