What I found was that the advice to indiscriminately strip of all fan leaves during veg, was bad advice. Yes the plant will now focus on producing stems, but at a much slower rate.
What I found was that the side branch from the node with no fan to facilitate it's growth, suffered as a result, compared to the lateral branch which had a fan leaf attached directly below.
What I also found was that after a certain point, the negative effect of stripping the fan leaf is lessened, to a point where you can safely remove the leaf without worry that it will impede the plant in any way. In other words, if you stripped the fan leaf just as the lateral shoot was just forming, it would develop at a much slower rate in comparison to one which had a fan leaf harvesting light energy. But, if allowed to grow and it's own leafs to form, the removal of the fan leaf at that point didn't effect it's growth much, if at all, in relation to that with the fan left on.
I found a very similar effect on bud development as well. Bud sites which were stripped of their adjoining fans before the shoots had developed, suffered a stunted start, whilst those which had developed slightly, when inspected later on and nearer to harvest day, had suffered little, if any growth impairment.
It tells me that there is a place for and a way to practice defoliation, but that, just like many gardening practices, it's a discipline and needs to be better understood to see the full benefits.
In the original thread by k33ftr33s he basically states the same. We allow the new nodes to develop with some true leaf before taking the subsequent fan.
Following the directions from those that have done it for many years is critical.