traicar,
These are different failure modes addressed in different ways. My suggestion would be that they continue to be so.
A tail rotor failure before a safety speed has been reached in a CAT A helicopter, in any type of departure, will (likely) result in a poor outcome.
A CAT A helicopter relies upon certification standards for avoidance of single-point-of-failure component accidents; yes the tail rotor and its drive system are weak points - that is why there are proposals to monitor their health.
These emergencies should be addressed as independent events. The probability of an engine failure is (about) 1:100,000 flight hours. The tail rotor should have a failure rate better than that. The evidence that I have seen appears to show that tail-rotor failures are a more common event on non-CAT A helicopters.
Jim