The Vietnam War (final chapter) was a great tragedy in part because the Washington and Hanoi misunderstood each other badly.
Washington didn't get that Hanoi was more nationalistic than communist and that they were indeed believing to fight an anti-colonialist war.
Hanoi on the other hand didn't get much right either, especially not that Washington wouldn't have been particularly interested in that rice pond if there wasn't this Communism and Domino theory thing.
The Afghans certainly don't misunderstand each other to any problematic extent, but what about the West and the Taliban (+ all those other armed violence opposition groups)?
Even if intelligence services, military leaderships and governments got it right this time - what about the general populations in the involved Western nations?
I've got my doubts, not the least because there's still a noticeable minority believing even in the completely fictitious 9/11-Saddam link, and many people in the West don't seem to discern between Taliban and AQ at all (which, in a complicated way, isn't completely off, but in another way it's wrong).
It should raise more than an eyebrow if war is being waged without full confidence in the understanding of each other's intent.
The "know your enemy" quote of Sun Tzu would now allow for a stylish finish of this post if I hadn't already pointed out the poor utility of Sun Tzu quotes. This kind of thing always comes back to hurt you...