This reminds me of a more cynical way of looking at the taste/ability gap. I can't find the source, but it's based on the idea that by the time you finish a creative work you've improved to the point where you can see a lot of flaws in it. You go back and try to fix them, but by the time you're done with _that_ you've improved enough to identify even more flaws. This cycle will repeat forever as you continue to improve, develop your creative voice and refine your tastes.