I don't understand this Seinen/Berserk emo-type boner everyone has. Like the new OP head writer for Netflix show said, Oda wants every chapter to have some serious moments and some laughter. Sanji provides the funny moments.
People want OP to be this super bad ass/serious manga all the time. You're reading the wrong series. Luffy himself is the goofiest motherfucker in the crew.