Needed copying a pdf file from iPhone to PC. That was absolutely impossible! Tried USB, WiFi and Bluetooth. None of the built in apps or sharing services allowed copying the file over.
I bet at some point there was entire team of people in Apple each paid >>200k USD with the goal "Make impossible a transfer of a single file out of an Apple device to a non Apple device, and for every incoming file from non Apple device pretend you don't know where it was saved and what it is even. Make it look like an incident."