It was a while ago, but I heard Foresight amounts to roughly ~7% physical damage reduction for tanks. No idea what it looks like now that we gain a lot more defense for every armour piece.

However, with Dragoons having less defense, it likely isn't as good.

And I'll admit I cross-classed Keen Flurry on my Ninja when progressing stuff like AS1 and Thordan Ex. <.<