It's like the supposed "Sanji Fans" don't understand him at all.
WCI surrounded Sanji's whole character & family,
Judge is weak, so he designed the raid suit to power himself up.
In order to avoid his children from going through the same drama of being weak he made genetic modifications to his own children & designed the raid suit for his children as well.
Sanji being the only one without the modifications is a reflection of Judge himself.
This is why he was so hard on Sanji that he will have to work hard to keep up with his siblings. (cause he has no exoskeleton or power even though I think DJ is his gift from Judge as well)
Sanji awakening exoskeleton is spitting in Sanji face, he's already using the raid suit which he hates, why have him regress even more by having an additional power up which he himself will hate every second.