In the movie Pink Floyd the wall why doesn't roger waters sing in the flesh?

In "Pink Floyd: The Wall," Roger Waters doesn't sing "In the Flesh" as a solo performance because the song serves as an introduction to the character's narrative arc and the themes of the film. The music is performed by the character "Flesh," representing the authoritarian figure and the oppressive forces in the protagonist's life. This choice emphasizes the disconnect between the protagonist's internal struggles and the external pressures he faces, creating a more dramatic and impactful experience for the audience.