At what point in the game is Gangplank ever weak?

He has become one of the safest and best laners in the entire game. This is a champion that is supposed to be a late game scaling beast but right now he is a legitimate lane bully, has tier 1 waveclear, amazing playmaking potential once he hits level 6, and snowballs like crazy if he gets even a little bit ahead. Gangplank has a free QSS, deals substantial true damage that scales amazingly well, gets free movement speed, and can generate higher gold than anyone he lanes against. I don't even play top lane but how has this champion not been nerfed or weakened in some phase of the game?
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