They really do not hire unqualified people though. If the need arises they can loosen their hiring policies but there is always a group of people who specialized in a job able to do it. For example, when Blizzard fired the 600 people largely from the broadcast section and then hired a bunch of people to OW and other game development sections, there was literally no feasible way to have a bunch of people in broadcast be game designers. That is a LOT of training that would go into teaching people even the basics of game design plus the likely lack of knowledge regarding even the foundations.