One issue with economy as a science is that it's a very soft science at best and just pseudoscience at worst.
Which then kind of defeats the purpose of experts in the sense of technocracy.
As an analogy, you can make a PhD in theology, but that is not proof that God exists.
Economics is very deliberately a pseudo-science. Orthodox economics starts from neoliberal moral beliefs and tries to justify and excuse them.
It's about controlling the narrative, not about modelling consequences.
Example: the way the supply shocks of the oil crises in the 70s and 80s were converted into a "keep wages low and raise interest rates to prevent inflation" narrative, when the rational solution would have been to move the economy away from dependence on oil as soon as possible.