Imagine being in a software team and disregarding what others are doing? Screw the rest of the team, I'll work on my own better solution and ignore the parts that are already working well!
You might end up with a good solution to the problem, but you'll also manage to piss off a lot of people ^^
A more valuable 'quote' from Feynman would be to "Test everything yourself". Don't just take for granted the results of others but verify it yourself. That (in the field of software) can be quite valuable :-)
Still, loved reading that blogpost!