There is an element of truth in that, but to go back to my earlier point, if a Prime Minister dissolves Parliament and loses, they usually end up losing the leadership of their party. Harold Wilson was unusual: he won three elections out of the four he contested, but survived after losing—by surprise—in 1970. He of course chose the date in 1970, but that was after a long period during which his party thought that it would win. In reality, most Prime Ministers go when they think they
will win. Most of them hang on when they think they will lose, in the hope of something turning up, which it normally does not, and five-year Parliaments can be tortuous and difficult.
I believe we should go back to the previous system of having some flexibility in when general elections occur. In reality, they normally occur some time in the fourth and fifth year of a Parliament.