This is pretty standard in all industries. Most people who work at a bank aren't financial experts. Most people who work at a hospital aren't medical experts.

Thats because most roles aren't the core of the business. Most are supporting the core. You don't need to be a flight engineer to build the system that tracks parts during manufacturing. You don't need to know how swaps work to build an order management system for traders. You don't need to know how to do surgery to build a scheduling system for the surgeons.