Personal pet peeve:
People will shrug off simple but effective ideas, but believe any overelaborate bullshit if it's presented right.
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You give someone a wrench, they complain it's not a multitool, or a smartphone, or a robot, but all they wanted initially was to fasten a bolt.
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People will really pay a dietician absurd quantities of money to design a diet instead of, e.g., not eating 100s of grams of sugar a day.
There are Reasons, of course, but it's still infuriating.