obviously, ponder is not brainstorm, we understand that, and you need to get over it. ponder defeats duress by keeping key cards (via the arangemnt of the top 3 cards) out of your hand till the turn the turn you plan to use them. This takes a minimal amount of planing.
I think you're stretching the qualities of Ponder a little too far in claiming it defeats Duress somehow. The best thing about Ponder is that it smooths out land draws and can get you mana sources when you need them. If you see a good card you need in the top 3 of your deck, you're going to put it on top- plain and simple. You're not going to put it two cards down because you think your opponent might somehow cast Duress next turn. Sure, you'll arange the cards in the order that best suits your mana curve, but defeating Duress is hardly a factor in deciding how to stack the top three.
i'm not claiming it always all the time beats duress, but it can be used to defeat duress. But yeah as we've mention it also smooths out land draws and get you the mana you want, much like brainstorm. Obviously you don't draw a key card if your not going to use it when you opponant is playing duress, its a
simple and correct play to make. Simply put, ponder can keep you from losing to duress, much like top, except cheaper, blue, and null rod proof.