I hate these drink-the-Kool-Aid articles.
Doubt is healthy and normal. If you don't have doubts about whatever path you're on, you're probably not thinking clearly enough. If you truly don't have any fears about risk, you're missing a critical self-protection mechanism that comes factory-standard for even the most primitive creatures on the planet.
In particular, when I encounter people who suggest that I shouldn't have any doubt about an financial transaction, I hide my wallet and back away slowly.