You were implying that Coca-Cola sells itself and therefore doesn't require singularly talented employees. It's a reasonable question to ask why a monopoly needs to hire unicorns to keep its business functioning.

(Aside from which: most tech companies are probably on the order of 60% non-engineers. The "engineer" part is a common bit of misdirection to elide the presence of the majority of FAANG employees, who are not engineers. People who can successfully sell plain water can probably sell other things too.)