The bit about tactile cues is interesting. When you think about how many aritificial cues are on fixed wing (stick shaker for example or g cues in aft stick) you have to wonder why its taken so long. Whilst I wouldn't blindly put them in without significant flight test why not have a cue for: incipient vortex ring, collective down cue on engine failure, lateral cues on reaching bank angle or collective cue on low height?
However some of the more modern afcs do sport some already when I think about it (power limit cue on Airbus Helicopter when you accel through Vy)