What you felt with the Cub model isn't always what the real one flies like. In fact I'd say that it's seldom what the real one flies like. Our models react differently from the real ones due to a number of factors. Designers often alter things on the model and we tend to run with different balance points, our models have less weight to move around so they don't model the inertial parameters of the real ones faithfully at all and finally the air is constant but our models are smaller so it treats the models differently from the big ones.

So when he suggests you do something "because it will......." it is only that model that will do that. Other models will react differently. Even another Cub of the same size but with different mods or other factors will react differently.