>The justification has to do with the composite material properties, but I don't know enough to clearly explain it here. So, I won't pretend to be an expert.
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Close!, but it was more like design loads and inspectability rather than just the material properties.
In return for only running a slightly less severe amount of released blade they heaped a whole lot of hurt on the follow on maintenance requirements for these blades.
Of course any engine (GE, RR, P&W) will be in a tight pinch if a single retention lug between blades happens to let go some day.