There was no development for Sanji in 1031.
-Sanji started WCI with => I hate my family, I want nothing to do with them or their technology
-Sanji ended WCI with => I hate my family, I want nothing to do with them or their technology
-Sanji during his fight with Queen => I hate my family, I want nothing to do with them or their technology
The character, his view on the world, his principles and/or his goal never change during the course of the last two arcs.
Sanji got depth during WCI not development and got none of that during Wano.
-Sanji started WCI with => I hate my family, I want nothing to do with them or their technology
-Sanji ended WCI with => I hate my family, I want nothing to do with them or their technology
-Sanji during his fight with Queen => I hate my family, I want nothing to do with them or their technology
The character, his view on the world, his principles and/or his goal never change during the course of the last two arcs.
Sanji got depth during WCI not development and got none of that during Wano.
Forgiving his family (forgive & hate is not mutually exclusive), giving up the one ability he dreamed off, finally able to ask a woman for help, is character development.
If we read the manga with deep immersion and less bias/hate toward a certain character, we can enjoy OP even more becausd Oda gives us a lot in his story.