Companies are organizations of people, and they want people with the potential to gain domain knowledge, be potential team leaders / managers, people who can in

Companies are organizations of people, and they want people with the potential to gain domain knowledge, be potential team leaders / managers, people who can interview future candidates, carry the "culture", represent the brand, etc, etc. If they just wanted some software written, they'd hire a contractor, or outsource it to another company/country.