I think the 'trouble' is that an author can suffer from tunnel vision and many of the myths have become common knowledge often defended by many. I was once told by a hobbyist that s/he simply had to believe (a myth) because s/he heard it from 'an experienced fishkeeper' on the internet. Well with the possible exception of 'The Crazy Russian', the internet is just full of experts (or people you don't know) that talk (er write) like they know it all. The world is full of wannabe gurus.
And lets face it...to a point we're all set in our ways and once we believe something to be true, it can be a real challenge to change that belief.
But then again, what do I know?!?! lol