I agree with what your saying but will disagree with most trainers available today. I have balanced, trimmed at full throttle, 1/2 throttle whatever and most high wing trainer type planes when trimmed at full will drop fast at 1/2 throttle or below. Now with the right setup of wing, engine and everything else one can acheive this in most cases, but a normal ARF version trainer from most MFG. NOPE trim to 1/2 throttle gives you lift when taking off and decent when landing. MHO.