It's a culling mechanism and nothing else.
Anything they want to learn about your motivation/psych/crystal ball/tea leaves they use their psych test.
Now back to all things VA, recent interviews have given opportunities to a string of GA drivers who funnily enough came from similar backgrounds to a lot of VA's current drivers during the boom years. I would hardly call that scraping the bottom of the barrel!
Those guys and girls made a decent fist of it, and I have no doubt the new ones will as well.
Lots more positions to be filled.....