There is a quote at the back of "Feet First" from a fantastic book called "Bad Medicine" by David Wootton, which I've mentioned on the blog before: http://rockleyfarm.blogspot.com/2009/06/what-progress-means.html
The many examples in "Bad Medicine" demonstrate how much our traditions, egos, hopes and fears can slow down progress, even when logically there seems no reason for the delay. Equally, we can often cling to ineffective remedies, purely through habit.
Of course, nowadays we expect that new medical or veterinary developments can prove that they are effective before we adopt them - its the key reason behind Project Dexter, after all - but our friend last week (who is himself involved in research as well as clinical practice) reminded me that research statistics, while important, aren't necessarily the be-all and end-all.
As he said, there will never be a double-blind clinical trial for a parachute.
I'd never thought of barefoot rehab as a parachute, but of course for a lot of horses (including most of the ones here) thats exactly what it is.