The origins of civil service independence
Launch library · evergreen read

Civil service independence developed from concerns that public administration functioned poorly when government jobs were handed out as political rewards rather than filled on the basis of merit and competence, an arrangement that tended to produce inconsistent and self interested administration, a reality that shapes expectations going forward, as a closer look usually confirms.
Reform movements in various places gradually introduced merit based recruitment, formal qualifications, and protections against arbitrary dismissal for political reasons, aiming to build a professional public service capable of serving successive governments impartially, which is central to how the system actually works, though the practical effect can vary considerably.
The resulting model, a public service that continues largely unchanged in personnel and expertise regardless of which party wins an election, is now widely regarded as an important structural feature supporting stable and competent government administration, a point that becomes clearer in hindsight, which is one reason the subject remains contested.