It baffles me how many threads there have been about TF Yasuo being nerfed when otherwise basically everyone hates Yasuo with a burning passion.
As for Gangplank, it's generally poor design if a champion is balanced so much around a single stat on a single item, like pre-rework Vlad and WotA. (I say a single stat on a single item because the issue that's brought up is TF losing crit chance, which just means Gangplank is hinging on getting both the 200% Base AD spellblade procs AND 100% more total AD from crits at the same time. If this is the case, then he'd likely need a general damage buff somewhere, but I doubt it's that simple.)