I told my dumbass buddy, who just started growing, this same shit, and I still don't get it... Apparently there's dipshits that these folks work with who try to act like they know shit from shineola, on the merit that they have grown a half-assed tomato plant and produced tomatos before, who tell these people to cut their fan leaves... I could bitch slap folks who give mal-advice like that... I have straightened my buddy out now, and he now knows the difference in selective pruning of over 50% yellowed fans, and the leaving the fuck alone of the big, healthy green ones... I had to break the whole photosynthesis thing down for him, and explain how the leaves act as the "solar panels" of sorts for the plant to convert light energy into plant energy in order to fucking grow, and that at best, what he will do is slow growth, and probably even stunt it, and at worst he'd end up with a hermie, or yet even worse, a dead ass plant... What a shame... Lol...