Some level of expertise matters, but…
“The man who created the syrup for Coca-Cola was not a chef — or even in the food industry.
Rather, the soda’s inventor was a pharmacist by the name of Dr. John Stith Pemberton, who was seeking to create a cocaine — and caffeine — filled alcoholic drink that people with chemical addictions to drugs (including himself) could use to wean off of morphine and other drugs.
However, when Prohibition hit, Pemberton was forced to take the alcohol out of his formula (though the cocaine remained for decades), and thus the first bottle of Coca-Cola was made in 1886.” — Bestlife
As seen in this example, unlike the general belief, a person does not necessarily need great expertise when facing a problem that requires creative solutions.
On the other hand, the general thought is that we believe we need greater expertise when facing challenging problems.
David Burkus calls this an Expertise Myth. “the belief that a correlation exists between the depth of a person’s knowledge and the quality of the work that person can produce.”
In the first place, this seems very much logical. In many cases, knowledge in a specific area helps to find creative solutions to problems.
However, in reality, as knowledge increases, after some point, creativity starts diminishing. Because it becomes harder to look outside of the box. An expert stuck inside his own expertise area.
Therefore, the best ideas come from people who aren’t experts in an area, and the best innovations come from the mixture of groups made up of these outsiders and experts.