My biggest problem with the RS is that it gives Sanji two things he worked his ass off to gain by himself during the time-skip. Lliterally spent years running and as a result, developed super-speed and ability to fly. Oda then gives him those very abilities with the suit, and thus makes much of Sanji's time-skip effort meaningless. He could've just settled with durability and invisibility. I can somewhat swallow the durability one, even though Sanji is plenty durable, and I like the invisibility. But no, Oda had to pile all that on Sanji..
At times, Oda can be an imbecile. This is one of those times.