That's what I had always heard would happen with rope. I snapped my synthetic line and it shot 70' of rope straight into my hood. Just a pile of rope when I got out.
I think the idea is that the rope doesn't carry much stored energy because it is so lightweight / doesn't have enough energy to do any damage, where a steel cable is heavy and carries a lot of force when It snaps- thus causing injuries and damage on anything it hits.
I have run both steel and authentic, and I have snapped both. I currently run synthetic on my front and rear winch, and would not go back to steel. The weight savings, ease of use, and added safety, just make it a no brainer for me.