The job of a Prime Minister is a salaried role with high expectations for performance. The management involved is complex and involves an organisation of significant size. The daily duties range from cyber threats to the nitty gritty detail of documents produced by his own staff. This is a daily range of activity that is definitely not for the unqualified.
It also takes a whole approach to the role that enables people to understand what it is. This is called transparency and it defines a lot of what people want to see right now from their top executives. The PM’s primary role is to balance functions across tasks, and this means involving people appropriately.
We all have to work at the same level of ability and this management bubble is entirely the Prime Minister’s own. His performance is rated on it, and his approval rating rises or slips based on a public perception of how he’s doing it. It may vary in terms of opinion, but there are objective facts to it, too.