It's not that I disagree with you exactly, but as someone who teaches at a UK university (much less prestigious than Oxford or UCL)... I used to complain a lot about how much money we were sending to Microsoft and Blackboard etc, but then someone pointed to me that the main non-outsourced piece of software we use (the main student records/teaching info system) is borderline unusuable. Horribly slow, lots of 90s errors like commas in course names breaking things, doesn't work on a tablet, etc etc. At least the Microsoft stuff works.