I agree, but sometimes having a jack of ALL trades; but master of none, means you'll scrape through.........hopefully !!  For WW2 a jack of ALL trades, was the last thing we wanted or needed; it required somebody, a specialist in ONE thing......our survival.  Unfortunately, when that time was passed; he was no longer the best person for the NEW task, it may have been harsh at the time.......but he's remembered as the greatest Britain of all time......I think he'd be happy with that accolade.  That's also why having a strong prime minister is essential, but no MORE essential that the strong team that surrounds Him / Her............THEN, hopefully, they'll have everything covered........I don't see any other way.