> They all are doing the interview wrong and everyone knows it
Most countries manage to devise the testing for a driving licence based on - at most - one theory test and one practical test. The practical test typically includes many different situations and manoeuvres in order to assess the candidate's suitabilty for being allowed to drive.
You don't sit a practical driving test in which you consider one single aspect of driving. The test attempts to cover everything. In one test.
Why would one not attempt to devise an interview along the same lines?