The professional (commercial) version of FMGS features failure simulation and additional options. It can be certified for use as an FNPT II + MCC trainer.  If you have been curious about FMGS and its used in a professional setup, take a look at some of Simnest online videos:

Their YouTube channel features several of their student pilots training in several challenging scenarios including – Electrical Generator 1 fault, Hydraulic Green reservoir low level, Elevated & Aileron Computer 1 failure, Green Engine 1 pump failure.