Well, it is certainly true that there are single point failures that require vacating icing conditions "As soon as possible", but I wouldn't go so far as to say it was a flight safety hazard! There are single point failures that require a 225 (or any type) to ditch, but that doesn't stop you flying over the sea in 60 kt winds at night (definitely not the time to ditch!)
If you look at Cougar's operations you will see the true value of a de-icing system (T.R. and I were shown some interesting photos recently!) It makes Aberdeen look like the tropics
