Unfortunately, selecting is hard. You select for certain things and then the actual job or position is another thing.
Typically two things can happen : either
A. Test and testing becomes heavily gamed by gatekeepers who have a vested interest in keeping the test like that, and the test drifts away from reality, or ;
B. Test disappears and is replaced by gradual commitment (i.e for example working 1 day together or whatnot).
SIgns of A. are plenty in declining economies (chicken or egg ? declining because of plutocracy, or predictor ?) while B. is on the rise in ascending ones.
Interesting times to be living in.
Time to build.