Even if they didn't release Ninja, you'd still have awful waiting times at low level dungeons. Especially since the low level Duty Finder roulette, even taking the "Adventurer in need" bonus, is awarding crap amount of Soldiery & Poetics (60 & 5)...
ESPECIALLY when you consider you lose half your skills and have your mighty 110+ gear sync'd down to 1-50... You can't speedrun those.