"Most surprisingly, the city claims its IT department is fielding HALF as many (!) user complaints with Linux than with Windows, reducing another major cost forever."
Uh, what? Complaints can change at any time and due even to "small" changes. Also, there could be changes in the opportunity cost of running Linux vs other operating systems in the future which could be realised/visible to ordinary users and thus cause a rise in complaints. But yes, for now, if the facts are right, they have saved themselves significant support cost.
Uh, what? Complaints can change at any time and due even to "small" changes. Also, there could be changes in the opportunity cost of running Linux vs other operating systems in the future which could be realised/visible to ordinary users and thus cause a rise in complaints. But yes, for now, if the facts are right, they have saved themselves significant support cost.
Rest of your summary deductions are sound.