like someone already mentioned , its all about builds, brute power vs speed % precision, builds arent just weapons ofcourse, consider armor slots , accessories, materia , even cross class abilities in some cases. question for all you min/max dorks will be, can you use garuda's low delay + other stat, to build a speed build that trumps current ifrit brute power builds? acc/store tp materia will be part of speed/precision build , obviously.

personally i dont give a shite if speed build doesnt overtake power build, i predict it wont, as long as its viable.
if anything it might come down to class/job, i can see it working out for MNKs .