this depends on the what you expected from arc .
Firstly , did u understand theme meaning right ?
Sanji was the one who have fight himself since childhood and solve everything in his own way till wci and his main role is cook of the crew.
Totally , sanji got what he needed.
What you expected from WCI?
I expected Sanji childhood explained and how he ended up at that restaurant before meeting Zeff. Okay we got that.
But it was said that Sanji was kind and not had being modified. Turns out that Sanji wasn't kind at all to his family or crew. Only to Zeff. Later at Wano he also had his genes modified.
Not only that but he didn't got proper fights. His fight with Yonji was off-screened, his fight with Judge wasn't all out and finished because Judge used human shield and Sanji was against it. He only clashed with Niji, Oven and Daifuku not an all out fight. Sanji at the beginning was portrayed to be superior than all his family but at the end somehow he is too slow and needs Raid Suit to be on their level...
Oda gives and Oda takes away from Sanji.
Remember that he wanted to save his family but at the end left them to die.
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Those arcs had family as a theme, but it wasn’t the main theme of the arc like it was in WCI
Marineford main theme was family. Ace son of Roger, executed because his dad was King of Pirates.
WB was his stepfather or almost that.
Whole WB's crew are considered family so all his brothers are risking their lives for him.
Dressrosa main theme is family too. Doflamingo became evil pretty much because of how he lived his early life as a Tenryuubito and suddenly he was poor and almost died to civilians because of his father being retarded. He killed his father and had his brother on his side. As he grow up he also consideres his crew as his family.
Then we have Rebecca that didn't remember her father because it was turned into a toy soldier. And we have Viola her aunt that was working under Doflamingo and Riku her grandfather that hide himself for years.
Law that wants to revenge on Doflamingo because of Corazon that he considered family too.
Wano is all about family. Oden, Momonosuke, Hiyori. Kaido, Big Mom and Yamato.