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              The PSF has withdrawn a $1.5 million proposal to US government grant program
 
            
            (pyfound.blogspot.com)
          
          From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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And I'm showing you, with sources, that you are wrong on both your points.
It can be reliably and reproducibly measured that diversity is more profitable. It's as "always" as tylenol helps against headaches, trains for travel, google for searches, gravity for keeping you on the ground. Yes, there technically are times these don't work, but it works more often than not, and typically there's other factors when it doesn't.
And similarly, yes you might not always pick the best candidate, but applying robustly provable best practices will lead you to doing it more often.
Do you go through anything else in life in this manner? That if you can't do it perfectly, you'd rather not try? I'd wager not, as trying gets you closer to your goals, even when not meeting them immediately.