There were Tesla naysayers saying EVs wouldn't work, that the model3 would never ship, that Elon was a 'fraud', etc. etc. - a lot of that is forgotten now, but it was rampant and constant and completely wrong.

I'd argue the problem is often overconfidence everywhere mixed with people who don't know what they're talking about.

I agree that stuff needs to be evaluated for substance, I just think there tends to be a pretty extreme status-quo bias by default so a naysayer is more likely to be wrong because of that.