Beg to differ - I did a comparison article many years ago for a Helicopter Magazine on non-moving sims, and you could indeed do acceptable engine offs and tail rotor failures on at least two of them (good autos in a sim depend on what you can see below the cockpit). One was the Frasca, and another was done by Steve Nelson which was 90% of the Frasca at less than a third of the cost. Trouble is, he wasn't a business man, but the technology is alive and well.
Phil