There's a name for the bias where something seems obvious once you've been told about it, but I can't remember what it's called (I don't think it's hindsight bias...)
"Hindsight bias, also known as the knew-it-all-along effect or creeping determinism, is the inclination, after an event has occurred, to see the event as having been predictable, despite there having been little or no objective basis for predicting it."
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