It is not related to challenge size. It really isn't. Nor is it related to the current state of DPC or its manifestions, as much as people insist sometimes.
It is related to state of mind and natural arc of improvement. If we look for ways to improve it is easy to find. And inevitably, as you improve, your appetite for learning changes, yet the table is not as full. Towards the beginning, everything is new...aperture, DoF, CS2, etc etc etc. But down the road, once you understand these ideas, you look for more.
Don't rely on comments necessarily for the learning aspect. Instead I would suggest you study other's work, read the forums, and perhaps pm'ing people with questions. Most people will be happy to answer direct pm's.
Those are my observations and that is what has helped me in the past.
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