Being an aero engineer in the simulation industry for the past 11 years, I can say that almost every simulator operator asks for the loss of TR thrust failure to be made easier to fly than flight test data suggests.
You may be asking yourself "Sim validation data exists for tail rotor failures?!" Well.... no, but we are able to infer how the aircraft will perform without the tail rotor using several specialized flight test maneuvers. But in the end we are just making a guess, albiet a fairly educated one.