The BBC goes looking to see if Dewey is still relevant in today's (UK) libraries and along the way they discuss some of the history of Mr. Dewey and his evident psychological 'issues'. These issues may have materially impacted the development of the system. So I guess, we should be happy that Prozac wasn't available. One other note: No mention of OCLC.
This audio article appeared on BBC Radio 4. Link. It is about 20mins and if you are a Dewey know-it-all you are not going to get much out of this.