First off, the main reason that you only have a small chance to get a certain drop from a mob is *because* of the fact that they're going to be back later. If there's only one of something, it might as well be fully decked-out at all times. (I'd like to see them actually USING the equipment too, but that's an unrelated rant.)

And the point of not having a respawning boss is to change the story. You killed him, he's not coming back to lead the bandits. But maybe his brother does, and they eventually regroup and that forms another, different instance. No, you won't have multiple people doing the same thing, or if you roll an alt you'll have to do something different. That's a good thing, in my opinion.