Oda intended for the ending of Wano to be a bittersweet and not fully satisfying thing.
why did Sanji just decide to leave Zeff to whatever fate big mom deemed? Don’t worry it doesn’t matter
why didn’t Sanji’s cake knock Big mom out like he said it would? Meh at least no one got killed by her anyway
what’s going to be the tragic sacrifice Jimbei and his crew make to let the strawhats escape? Nothing
what happens to the Vinsmokes who also sacrificed themselves for the strawhats? Nothing
what about Sanji’s entire conflict regarding his self worth and his Families beliefs that his genetic inferiority makes him lesser? Don’t worry, his Germa genes will come in later
Maybe you weren’t on these forums back then and have not come across the general dissatisfaction around the end of WCI and the the immediate following defenses like “it’s intentionally bittersweet” made by Fans… when in reality it was all simply that Oda was ignoring the dark aspects of the ending of his arc