I can't disagree that it would be reassuring to many if a minister appeared to know a fair bit about his subject but I found some of the best managers I had were those with little depth of experience that just let me get on with the job which I knew well, and took and respected my advice when required, and only gave me guidance when I needed it, rather than trying to do the job for me.
However my memory (mainly kindled by Spitting Image!!) was that in the 70s and thereabouts there were a number of strong characters surrounding the PM but that is less so now.
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