If the expression is true, the hardest problem in Computer Science would be naming cache invalidation strategies.
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It's incredibly hard to explain adversarial problems to users. I see gamers sincerely asking "why doesn't the publisher just fix the cheater problem?".
This is exacerbated by the fact that sharing too many details of anticheat can make the problem worse.
Is there a programming equivalent of the strawberry problem, i.e. a specific coding task that LLMs are consistently bad at?
Designing UIs is such a hard problem.
Sometimes I try a bunch of options and I settle on "this one seems the least annoying".