If you try to teach a student (ab initio) on base that power is controlling the speed and elevator the flight path, there will be a few senarious that they wont understand, firstly high and slow, they will apply power. Another classic is fast and low, they will decrease power, and end up even lower.
For a slow n high scenario we teach lower nose for approach profile, adjust power for speed (speed will increase anyway)
For low n fast, raise nose for approach profile, adjust power for speed (speed will decrease anyway)
Attitude only controls airspeed when power is fixed