In the US presidential system, the incoming administration
can (and does, except perhaps if it’s a continuation of a Democratic or
Republican governance) implement wholesale personnel and policy changes,
subject only to the constitution and the oversight of Congress. Clear, simple,
well-known, longstanding tradition.
In the UK, there is a persistent professional civil service,
which generally endures and survives changes of government. It provides
continuity, assurance, stability and implements the policies of the government
of the day. Clear, simple, well-known, longstanding tradition.
And then there is a third, muddled, alternative. A bit of a
cross between the two traditions, where whim, disguised settling of scores and
jobs for pals tend to rule. Why not opt for one or the other tradition and be
open about it?