In all fairness Oda regularly portrayed the raid suit as a weakened version of Sanji
Why Sanji would ever use RS that he detest in the first place was because he think that RS would give him boost so he could ended the fight with P1 quicker.
Even during the fight with RS, we saw that Sanji explicitly state the advantages of RS.
If this is Oda's way to regularly portray RS Sanji as weaker version than non-RS Sanji, I really can't see it.
Narratively speaking, I actually see the opposite.
It is how Oda tell the reader about some of buffs that RS offer.