I was looking for the exact quote from Cladhaire, so this MAY be paraphrasing:
If you get no benefit from a lib over doing it yourself, don't use it.
I'll keep looking for the exact quote, but that's what I took away.
From the dicussion of AceLocale:
People are always asking "Why should I use Library X?". My answer has always been that if the library doesn't provide anything extraordinary over the method you're using, or happens to be more expensive without much gain, then you shouldn't be using the library.