Cloud computing is about centralization, the ability to push workloads that run on expensive on-premises systems to cheaper systems on public clouds.
This centralization lets us share resources with other tenants to reduce costs, thus increasing overall efficiency. Centralization provides a single location for data that may have once existed in many enterprise silos. Plus, it lets you centrally manage processes and systems with a single set of tools.
Essentially, we’re moving to cloud-based platforms to take back control of our systems and do a much better job of managing those systems centrally. The cloud’s cost advantage is really a bonus; the cloud would be a better option even if its costs were the same as the traditional on-premises data center.