It's so many things. Dishonesty, lack of technical competence, political pressure, hype, organization structure, and incentives.
If I had to summarize though, it's that the median performance in any field will be at much lower levels than outsiders expect, and some fields with hazier results have this level set very, very, very low, especially when they're hyped up. But also that the market is actually at least a little bit efficient, but over long time scales. I think there's a 50%+ chance that the role of Chief Data Officer begins to die off, but also that it'll be replaced by something silly.
If I had to summarize though, it's that the median performance in any field will be at much lower levels than outsiders expect, and some fields with hazier results have this level set very, very, very low, especially when they're hyped up. But also that the market is actually at least a little bit efficient, but over long time scales. I think there's a 50%+ chance that the role of Chief Data Officer begins to die off, but also that it'll be replaced by something silly.