Like I said after my semicolon (;), that it's a statistical truism doesn't mean it doesn't exist. https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect#Statistical_and_better-than-average_effect One can prove that this effect will always exist for statistical reasons? That's good to know, that not-so-competent people are more prone to overestimating.