Final answer:
The 'perfect simplicity' of the commission plan refers to its streamlined decision-making process, direct accountability due to fewer elected officials, and minimized bureaucracy which aims to cut inefficiency and corruption.
Step-by-step explanation:
The author might refer to the commission plan as having "perfect simplicity" because it streamlines government operations by having a small, elected commission conduct all legislative and executive functions. This contrasts traditional forms where responsibilities might be spread across a larger bureaucracy. It simplifies governance by having each commissioner, including the mayor, directly responsible for specific areas, increasing directness and reducing the potential for inefficiency, while limiting the number of those charged with city management.
In line with Progressive Era reforms, it could also imply that this system reduces the potential for corruption by undercutting the influence of political machines and bosses, making the government more accountable. This is because fewer elected officials typically lead to increased transparency and accountability, as well as simplified decision-making processes. Thus, citizens could find government procedures easier to understand and manage under this commission system.