IQ
An interesting commodity is intelligence, as defined by PhDs, ATPL passes or what ever yardstick.
In another life I was a TAFE instructor & one year I took a bunch of wide eyed youngsters to the Sydney QANTAS base. One of 'em asked the recruitment officier what he looked for in a prospective wide body pilot. "we like 'em bright", he replied, "but not too bright"!
Weirdest experience of my life was purchasing a little seconf hand Robbie which brought me into contact with a bunch of millionaire private owners displaying a whole different other kind of 'intelligence'.
Personally I'd like to see a CSQ exam, more pilots with a high 'common sense quotient' would do nicely.