SAAS exists to serve these companies pretty well. The cloud has helped even more with getting services procured for less than the granular cost of a full time employee.

It's a big paradigm jump to go from SMB with mostly externalized functions/SAAS to getting economies of scale with your own major IT department, assets, and facilities.

I've argued for years that MBAs need to be trained on the fundamentals of IT as much as finance and accounting: large enterprises are all IT organizations now, and good IT is a major major competitive advantage in the marketplace and a primary source of large economies of scale and efficiencies.

The biggest example of this is Amazon, which essentially competed in the retail space as a very well run software/IT corporation. And now they dominate not just online retail but the cloud.