This. On one hand, we hate credentialism and criticize those who arrogantly wave their diplomas around as a substitute for making good arguments. On the other hand, we're enamored enough with SpaceX and Tesla to give Musk the benefit of the doubt, even though:

- The Hyperloop is a very different type of engineering compared to anything Musk and his engineers have done before (competency in one field does not guarantee competency in a very different field),

- The analysis has some serious issues. A trivial example: the thermal expansion issue in this blog post has been brought up in user discussion several times in previously posted Hyperloop articles on HN, and nobody was able to post a good response or justification.