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OP found a different source of joy: "I wanted the fun of working through the problem myself, rather than just implementing someone else’s research."
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Fair enough.
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Reminds me of a story a coworker told me about his band rehearsal when the new drummer counted one-two-three-four-five-six-se-ven-eight.
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as with every discipline that AI and therefore computers can reason through suddenly:

you could always do the discipline you liked before for self fulfillment purposes, and you can still do it for self fulfillment purposes now

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But most people who want to get good at their main discipline, even for self-fulfillment purposes, have been gaining the necessary experience through their job, because an unrelated job takes away too much time to do so.
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