One other aspect - "It won't work and even if it would work we don't have the skills to execute it" has a strong prior probability. Easily 80% of attempts fail or are inappropriately skilled at the start.
That means someone saying consistently "this won't work" is (a) generally going to be right, so feel clever (b) very likely to miss all the big opportunities in life.
That means someone saying consistently "this won't work" is (a) generally going to be right, so feel clever (b) very likely to miss all the big opportunities in life.