She still does, but only when she is fighting against ninjutsu or inferno, because those variations are out ranged much easier and can't properly stuff her strings in between when whiffing. Hellfire has flame aura so one cannot just put limbs out from every possible range when it whiffs.
Where ninjutsu struggles Hellfire shines due the flame aura and its active frames, its not something to mess up with it since it conditions people to not just relentlessly put limbs out , where hellfire struggles in range, Ninjutsus covers it up, MU like WG Kotal, SQ D'vorah etc most of the time o prefer using ninjutsu mostly. On Cage you definitely want to use hellfire, at least against A-list, rc vs rc, and s3~rc~21 is a blockstring.