This philosophy - "the more you know, the worse the results will be" - has been found valid in many fields. It has even been published in respected journals. Some believe that there is an upward curve in creativity and productivity as we learn, and that this will peak and then begin to decline as we learn more. Some say that with too much knowledge, you begin to outthink yourself. Or, you can put more "knowledge" into a project and less creativity.
Whatever the reason, I have heard this same theme since the '50s.