Why can changing the order of themes weaken a symphony or sonata?

In the context of musical criticism, changing the order of themes in a symphony or sonata weakens the work because it disrupts the composer’s carefully established "creative principle of contrast distribution".1

Themes in a masterpiece are not interchangeable; they are designed to fulfill specific roles and possess a structural necessity for one another. A composer selects a specific thematic chronology to maintain "structural tension," which is the foundation of musical interest. Because music is a temporal art, the controlled use of time is essential; altering the sequence or proportions of these themes ruins the dramatic effect and the organic development of the work.12

Furthermore, in sonata form, themes are often organized to navigate a complex interplay between thematic design and tonal schemes. By shifting the order, the listener loses the ability to perceive the "reconciliation of opposites" that defines the form. Ultimately, themes develop out of each other because they create a musical need for one another, and altering this sequence destroys the internal logic that gives the composition its integrity.341