Domain experts may lie, they might be sure that idea will never work but still propose it in order to increase company valuation, get funding, etc.
Example: self-driving cars. Probably, experts that work in this field are confident that self-driving cars are impossible even 100 years in future, but working on self-driving cars gives them money.
Example: self-driving cars. Probably, experts that work in this field are confident that self-driving cars are impossible even 100 years in future, but working on self-driving cars gives them money.