User blog comment:Fliu/Chapter 989 Thoughts/@comment-30281369-20200907133003/@comment-30281369-20200908040549

The suit increases Sanji's capabilities; so there'd be no reason for him to not use it unless he didn't need it, I mean, more than likely it was thanks to that suit that Sanji didn't get killed by King so that already confirms that he needs it to contend with the Yonkos and their forces. Regardless of how much he hates the vinsmoke name, if his crewmates lives are at stake, he would be more than willing to put up with it and use the suit if it would give his crew a better chance at survival and perhaps victory.