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Andreas Kling is a legend. He and his team really bring back the hacker ethos. Grind on hard problems people, instead of grinding on leetcode.

Aren't there some hard problems on leetcode?

I can see this analogy as:

"Don't do your math homework. Instead, find hard math problems in real life to solve."

This does not make sense in terms of expected utility.

maybe for your utility function

It makes sense in terms of having fun.