For passionate phrases, the main reasons why the climax point should not be too weak are as follows:

1. Emotional expression: Music is an extremely effective way of expressing emotions. In passionate phrases, the audience expects emotional release and catharsis. If the climax point is too weak, it will give the audience a feeling that their emotions have not been fully released, and the expected musical effect cannot be achieved.

2. Expectation satisfaction: When people listen to music, they will form expectations for the climax based on the ups and downs and direction of the music. If the climax is too weak, it will break the audience's expectations and leave them feeling disappointed and dissatisfied.

3. Power maintenance: The climax of music is the most dynamic and energetic part of the music. It requires sufficient power to maintain the tension and momentum of the music. If the climax point is too weak, the power and tension of the music will be greatly reduced, making the entire phrase feel weak.

4. Music structure: Passionate phrases are often at the climax of the music, which is a requirement of the music structure. If the climax point is too weak, it will make the entire music structure appear unbalanced and destroy the integrity of the music.

The impact of passionate phrases on the climax point:

1. The overall atmosphere of the music: Passionate phrases usually require a fast and intense musical atmosphere, which requires a strong enough to reflect the climax. If the climax point is too weak, the overall atmosphere of the music will not be strong enough.

2. Musicians’ playing styles: Different musicians have different playing styles, which will affect the climax of the music. Some musicians may pay more attention to emotional expression and play the climax more powerfully; while other musicians may pay more attention to details and play the climax more delicately.

3. The creation background of the music: Some passionate phrases are specially created for certain specific occasions or events, such as victory in a game, atmosphere of celebration, etc. The climax of these phrases needs to match the occasion or event. If the climax is too weak, it will make the music inconsistent with the emotion of the occasion or event.

4. Cultural background: Music from different cultural backgrounds often have different characteristics and styles, which will affect the climax of the music. For example, in traditional Chinese music, the climax is often the most high-spirited and exciting part of a piece of music, which is related to the traditional emphasis on emotional expression and power maintenance in Chinese culture.