Something that may be related is that the further you get in an area, the less structured coaching available (through textbooks, academic advisors, etc..). In this sense, a new problem pops up, which is learning to decompose complex problems into simpler pieces. Something that is often done for people in the early stages of learning (and I find super difficult without collaborating with others).
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As time passes, free time gets rarer, problems get more complex, and it gets harder and harder to keep many open problems on my mind.
What you quoted is probably a genius not aware what limitation is the bottleneck for most people.
Something that may be related is that the further you get in an area, the less structured coaching available (through textbooks, academic advisors, etc..). In this sense, a new problem pops up, which is learning to decompose complex problems into simpler pieces. Something that is often done for people in the early stages of learning (and I find super difficult without collaborating with others).
While Ed Kmett is in fact a Time Lord, that's largely because he doesn't seem to require sleep the way the rest of us do.
(I know him IRL.)