I couldn't find the text of this joke, attributed to Dirac. I'll paraphrase.

A man walks into a pet store. There's a parrot for $100, it says this parrot speaks perfect English . The one next to it is $1,000, and says, This parrot speaks 12 languages fluently.

Then there's a bedraggled looking, droopy, parrot, and its label simply says One Million Dollars.

Does it sing opera and has successfully run for President? the man asks with a sneer.

This parrot, says the store owner, _thinks_.

That's what this entire post is about - how to evaluate people with a series of attributes, score, correlate, blah blah blah.

Hire them, see if they think. If they don't, fire them. It's cheaper than this credential/signal rigmarole, most of which is about CYA legal b+llsh1t. Yes, it's a simplistic strategy and it doesn't work for Shoogle, Banthropic, Goober, whatever. You know what, boo f*cking hoo. You're a trillion dollar company, suck it up. You have a zombie horde at your doors and you're just upset the "true gems" are hard for you to spot amongst the slavering masses. You're going to heartlessly lay them off anyway in a few years. You SHOULD feel this pain and anguish of having to sort through them, constantly regretting all your choices. That's the only way to have balance in the Universe.