Training in an unstabilized helicopter with foggles is not the same as being in cloud in an unstabilized helicopter. World of difference when you really, really can't see outside.
And while a force trim system helps with flying in clouds, it does not make the helicopter more stable. And the force trim system really only helps if you use it all the time - not just when you go into clouds.
Same as any stabilization system - has to be used all the time, not just when the weather is bad.