Let’s rewind a bit. The cloud emerged somewhere in the mid-2000s. Before its development, enterprises relied on their own infrastructure to house everything they needed for software, small business apps, or programs. Engineers were required to manage the hardware and software.
Put yourself in the engineers’ shoes, other than development, you still need to mind the integrity of your infrastructure. This includes servers, networks, storage, services, and application. Managing the hardware, let alone the software, is an expensive process that requires skilled technicians.