And if you're hiring an accountant, or a sysadmin, or a teacher, how exactly are you going to judge them on the quality of their work? Ask to see some books an accountant has worked on, some servers a sysadmin has maintained, and some kids a teacher has taught?
Its all well and good to judge people on the quality of their work AFTER they are hired, but very few jobs allow are like the orchestra example and allow for an interview to consist of "do your job for a few minutes / hours and a fully informed hire / no hire decision will follow".
Biting the hand that feeds IT
