Why does zac have interactions with ground based cc?

So many games where I get frustrated playing Zac because I get caught in land/area based CC when I slingshot. I feel like he should ignore those when he is airborn. Does it make sense that trundle pillar can hit Zac when he is at his hoghest and he drops it "under" him? Heck no it doesn't.

I get missle based cc thats basically anti air fire at him but ground based stuff shouldnt stop him so efficiently. Just so tired of invisible walls when fighting against veiger and vicktor.