Thanks for your answer! I get your point, but having speed on the elevator and thrust controlling rate of climb/descent does not make sense to me. Let’s take climb as an example, in flight school we are all taught to just apply full power and pitch for target speed. Vertical speed is a parameter that is never controlled, it’s always incurred.
Talking about a 777 that is trimmed for speed, starting from a level flight position at a given speed…simply adding thrust will put the aircraft in climb at the same speed. No (or very few - to damp oscillations) elevator input will be required. Having thrust controlling rate of climb and elevator controlling speed…won’t both interfere with each other ? Pitching for speed will change rate of climb/descent thus changing the commanded rate of climb by our new thrust setting.
Thanks !