A loss of control of the propulsion is still a loss.
Ask Michael Hastings if his car racing off on him was a deficiency or not.
How many ways can you say it wrong? They apparently lost control of the steering. Ships that size do not steer with their propellers. People who know these ships say that the cloud of black smoke seen exiting from the engine stacks before the crash was due to the engines being throttled up after reversing. So the propulsion systems must have been working.