Imagine the following scenario: Constructor A has built the fastest GP car. In a season of 20 races it wins each one of them. But it is only the winning car that finishes the races in the top three. The other one due to bad luck is in fourth place in half of the races, in the other half it retires (technical failures, collisions, driver errors, whatever). Even with clocking the fastest race lap every time the points total is 640.
Constructor B has built the second-best GP car. It is bullet-proof, the drivers are faultless, they finish second and third in every race. Their points total is 660.
So we have a car that wins 20 of 20 races, but the winner of the Constructors championship is a car that has not won a single race.
This is to show the silliness of the regulation that both cars count for championship points. If only the best-placed car would count (as has been the case in the past, for the last time, I think, in 1978) we had constructor A with 520 points and constructor B with 360 points which is a fair result.
The current ruling turns the Constructors championship into a Team championship, neglecting the difference between these two. There is no doubt that constructor B’s team performed better than constructor A’s team. But the better car, the better constructor can only be A.
The fact that there is the arithmetic possibility that a builder of a car which wins each and every race fails to win the Constructors championship is a travesty.
The powers-that-be should revert to the old system of the 1970s or they should officially announce the end of the Constructors championship and frankly call it Teams championship instead.
Note: The official F1 website is ambiguous in this regard. Under the headline “Constructor standings” ”Teams” are listed. But I think the official term is still “championnat du monde des constructeurs”.