and not some simplistic BS that only works under limited circumstances.
it seems to me that attitude=airspeed and lever=height works from the hover, up and down the power curve to Vmax unless you meet a power limit that prevents you raising the lever or you have extremes of attitude.
Conversely, using collective to control speed and cyclic to control RoD only works in specific circumstances and only when using the higher autopilot functions.
If you want to fly a helicopter like a FW, then fine but it seems to have worked for many years when flown as it was designed.