Focus or Variety in answer

This is kind of technical but I’ve noticed that
the examiner has preferred a more focused
approach to some answers using a couple of points
fully explained. When this happens the mark
scheme tends to reflect this.
Since we cannot possibly predict this will
students be penalised for writing diverse points
as this is what is generally taught?
The degree of application required in 3 hrs seems
impossible and I would assume that general
points with some relation to the scenario should
earn marks.