I think it's more than that. Big companies like this don't exist to provide solutions in the most efficient manner possible, nor do they (contrary to popular opinion) exist to create the most "shareholder value". Their real reason for existence is to provide employment. (True, the investors really only care about RoI, and would prefer more efficiency with a lower headcount, but the reality is that you need to hire people to actually build things and create solutions to sell, and for those people, including the top executives, the company's mission is not their priority, only their own personal career and bank account.)

So with a company full of people whose #1 concern is their paycheck and their resume, they'll make choices to optimize those, which means turning a trivial 20-minute shell script into a 3-month project requiring a whole team of devs.