So let's see Oda's opinion, shall we?
Sanji gets called to the tea party and gets threatened.
He says he will deal with it and be back.
Luffy decides to go after him so he can assist them in the Wano raid. "he's as strong as 1000 people" bla bla bla.
Entire WCI happens so Sanji gets back.
Sanji doesn't get a fight in the Wano raid.
Congratulations, you've just thrown in the trash the entire reason WCI happened.
Yes, keep thinking Oda is "brilliant" like that.