I understand what you mean but you have to consider the variables - depending on your grow environment you may need to groom your plants to optimize light penetration, ventilation, crowing, etc.. If plants were at their absolute best on there own, the best way to grow would be to toss some seeds on the ground and wait 5-6 months. But if you do that (especially indoors) you end up with a bunch of weeds, few at the top flourishing while others are rotting and being consumed by pests and fungus.
Growing indoors is about environment control. If that means chopping down some leaves - so be it. But to each his own. Personally I could give a shit about how other people grow.