How does WCI imply a change in his simping/perving behaviour?
It's just a personality quirk, among others, that sometimes has minor implications on plot. I don't understand the fuss. Every character has quirks. If something keeps repeating...why the expectation that it will change? Sanji "getting over" or "resolving" this "issue" serves no purpose to his character because it isn't anything serious to begin with. Sure, I can see some annoyance with it if you expected him to drop it at some point, but at 900+ chapters that expectation just becomes unreasonable especially when you see it becoming more exaggerated over time.
If Sanji didn't have this he'd 100% just be a smooth and straight pimpin' ladies man which would probably rub the core Japanese male reader ship the wrong way. Not that I'd personally dislike that, but I don't understand why this is a deal-breaker for some people.
The problem is that this hypersexual simping behavior actually
IS 90% of Sanji's character post-skip, whereas it really only was a background quirk pre-skip.
Just look at him on Wano. What were his actual meaningful scenes/plotlines?
1) Him cooking noodles for women and flirting with them, completely ignoring his actual task of having to find capable (male) samurai (got called out by Franky because of that).
2) His fight with Page One.
3) Him drooling over Komurasaki and later on envying/threatening Zoro because of her.
4) Him using his raid suit to stalk naked women - especially his female crewmates - in a bathhouse.
5) Him ignoring the war and going for whores in a brothel the very first minute they arrived on Onigashima.
6) Him rescueing Momo and kicking away King.
7) Him simping for Black Maria.
Out of those seven meaningful scenes he got, five of them (!) revolved around him being a simp/sexual predator.
That's just idiotic beyond belief.