Although I agree there are some basic artistic principals that make viewing an aquascape a more pleasing experience for the viewer, your taking it too far. Firstly, most don't view planted tanks this way. At best, yes it's art, but for most it's a hybrid-type hobby between placing hardscape, growing plants and yes fiddling around with it. You really can't compare a living scape to a painting or that mobile you used as an example. The aquascape will change over time and things need to be adjusted not only for an artistic reason, but sometimes for the plant to live, etc. It's not static, it will change sometimes very quickly. You come across as preaching, but your choir is somewhere else.