There is one person that has been posting in this thread that would argue with his turd, that there was a better way to come out of his ass. I can not believe some of the stupid comments that come from this Butt Muncher.
Yes you can clip all the fan leafs off, but why would you? You do want to trim some of the lower fan leafs and scraggly branches away to help air flow and to allow light to get down low. But to each his own.
Some people grow plants that are very bushy and full. This is why they trim things back, if not no light would get below the canopy. Other people grow bean stocks. It also depends on the strain and genetics and the technics that are used.
Later in the flowering stage the plant will start useing some of the nutrients that are stored in the fan leafs. Plus the plant does pull energy from the light from the fan leafs. So yes, trimming away some of the fan leafs and scraggly branches can help, but to Rape your plant of all fan leafs is just crazy, unless it is late in flowering and they are all turning yellow.
But to each his own. If you like to remove all the fan leafs, have a ball.