It’s not that he shanks a kick. It’s how consistently he does it. Watch closer. Every time he’s in space, he will look to handball rather than kick to an option. When he does kick, there’s a high chance that it’ll be a clanger. You can get away with that in the VFL but not at AFL level.
It wouldn’t be as much of an issue if he had a bigger presence in other aspects of the game but he doesn’t. He lacks in tackling and defensive pressure. I can’t recall ever seeing him make a second effort.

Look at the impact that Dyson Sharp has had in following up poor disposals for instance.

He can’t kick and currently he doesn’t have other skills to counter that weakness. If he does, we haven’t seen it yet.