Interesting discussion looking at this from a point where the train for a "screw driver free" switch panel is just passing the point of no return. As far as I can see our future here in Europe, screw terminals really will be completely "out", as forces applied on the wire are not physically "defined" but depending on the feeling of the guy who wires. And a 90° turn and click will not only be safer but also cheaper even for 63A busbars as we all cost too much.
As a matter of fact a receptacle with screws usually is just cheap rubbish today, a certain sign of minor quality. The main idea is that copper is "flowing off" so the screw might get loose with the time and get warm thereafter, whereas a quality spring will always keep its forces.
