Earlier quoted context omitted.
My experience: I proposed a thesis to an advisor who deemed it unlikely to work. He ran it by a colleague who came to the same conclusion. I went to a different major and pursued the same thesis and invited the previous faculty who initially turned it down to the defense because it was relevant to their field. It was frustrating to hear them voice their opinions in the defense that they felt, “of course it world work…
https://en.wikipedia.org/wiki/Hindsight_bias
As I recall, he restructured his lectures, asking upfront for a show of hands as to which outcome everyone anticipated, before the big reveal. After making this change, he had fewer people approaching him after lectures saying how obvious the outcome was.