Truth is, the less you know about a subject, the more you believe yourself to be an expert. Only once you have some experience do you start to recognise the breadth and depth you have yet to learn. I’ve seen this a lot in the field of finance, productivity, design, and startups. Stupid amateurs think they know it all.
Unless you really have faith in their credentials, chances are that all these “experts” are suffering from The Dunning-Kruger Bias.