I see the logic in it, the leaves being so big they block the sun and "suck it up" for themselves, but that is just a myth as middieman pointed out. Those leaves aren't stingy, they're lookin' to spread the wealth. If you do feel like letting more sun into the buds, one thing you can do is take a pair of scissors and cut the leaflets to half their length. It's not recommended or neccessary, but some ppl claim it helps. I'm not one of them, but to each is own.