Just blowing does not relate to playing the trumpet. The lips open and close like valves, completely stopping the air (check this link: IWK Brass Research ) The teeth are also in the way, so that even if the arched tongue did something, it would be cancelled. Proper playing finds equilibrium between the backpressure of the horn/mouthpiece and our airpressure blowing. If we blow too hard, the lips would collapse into the mouthpiece cup. The only argument that makes sense to me is turbulence in the mouth.