That's not completely true. I agree that having a twin isn't necessary for training, especially considering the increase in cost. But there are EPs where you have to manage your engines, just like for AMEL. Whether it's dealing with component failures (DECU/FADEC) or engine failures, there's still some managing that eventually needs to be learned.I've heard people push twins because that's "what they'll fly in the fleet," but that always seems weird--it's not as if helos have asymmetric thrust. There's no such thing as "managing" two engines in a helicopter. What you're saying is proof of that point.
But again, for the cost, that skill-set can be learned at the FRS.
A guy I work with now was a Navy -60 guy and then went on to fly several AB variants and the Koala (which he was a big fan on). We were chatting about this the other day and his opinion was that none of the options were optimal because if you're first learning how to fly helicopters, it should be in something that you actually have to hand fly to get the helicopter feel (ie, no/minimal SAS, minimal automation, full autos, etc). It was an interesting take and I can see his point. Since what he describes is pretty much a -57, obviously there isn't a viable candidate that matches that that can also do IFR.The point of practicing autos to the deck in a trainer is that you can't do it in the fleet and it's occasionally still necessary--fuel contamination and tail rotor driveshaft failure.