"A little more oomph, particularly with aggressive builds"
So where are the players building AD on Poppy?
Despite the fact her defense was reduced in favor of damage/cd buffs to Q to encourage damage builds, she's still most often building no AD whatsoever. But in this game, most often doesn't imply most effective, and even then, most effective doesn't imply effective.
And she's suffered because of it. Her performance against counters is terrible compared to her performance against champions she's supposed to counter. (roughly 58% loss rate vs. only 54% win rate)
I personally like a more damage-oriented Poppy. It hearkens back to her pre-rework "pick someone and shove your lollipop in their chocolate factory" playstyle. But they aren't going far enough to make her focus damage. Her passive should have some kind of damage scaling, at least. Even if that means reducing the shield.