Most model airplane flying field experts have no idea how an airplane flies, as all they understand is power makes it go faster, and yanking on the elevator makes it go up.
Since there's relatively little time spent in trimmed level flight, these simplications are "correct".
The ultimate simplification of course is control-line flying, where power is constant, yet the plane manuvers with elevator at what appears to be a constant speed.
When you get into distance flying when the plane might go for miles without any control input, you begin to see the full-scale practice of power to climb-dive, elevator to speed up/slow down.