I interpret mastery not by knowing its complete bloated feature set, but instead by saying that for any effect or purpose that I turn to Photoshop to solve, the

I interpret mastery not by knowing its complete bloated feature set, but instead by saying that for any effect or purpose that I turn to Photoshop to solve, the challenge is completely in the design of the effect, not ambiguity about the use of the tool. But then, you never stop learning.