[username444]

To be fair, people said this about Tesla and SpaceX as well.

Given his track record, I'm inclined to believe he understands the problem space and how to solve it better than you or I.

Yes, the burden is on him to execute, but that will take him years. The argument that "I don't understand it therefore it's invalid" holds little meaning. Musk isn't a person who gets this deep into a project without a high likelihood of success, historically.