vertalop,
Actually not. The turbine burst protection is gained mostly by working the physical geometry of the engine installation, such as the placement of the pods, which are carefully packaged to place the burst zones away from hydraulics, spars and the like. The old wing-root packaging (Comet) and tail mounts (B 727) are now gone. In fact, it was an L-1011 burst that caused the change in FAR. Recall how that third engine was packaged. No blade shed excuse would work on that machine.
The packaging of critical control rods next to engines, along with primary servos and the close proximity of a sister engine would be frowned upon in that airliner world, but are accepted when grandfathering an older helicopter.