Where did I say "doing this produces a 100% success rate". Surely you understand that the ability to use it more often, increases , or at least should, increase the likelihood of your successions? I main blade run tarantella. Usually have my super mid to late round 2. That makes a hell of a difference, generating kills is the main aim and nightstalkers forte is the wombo combo as the super is meh imo. So having the abilities that make that subclass what it is, is extremely important and mostly beneficial in my opinion.