Another example would be leaving Jack alive after the opening of Lost?
At any rate I can see the commercial advantages. Artistically, making corrections is better than ignoring problems. I guess by "organically" growing, you're thinking of something like algae or grass, which will grow wherever it can, heedless of form. I was thinking of flowere or animals myself, where the arrangement of petals or the size of the liver are more or less fixed by necessity. (In my version of the analogy, artistic integrity=biological functionality.)
Thanks for a clear explanation.