I see why they would do this, but ...
I can't wait to start trolling them - especially when it will undoubtedly come to them installing updates on a disconnected/broken device and they need to be on a USB storage device of some sort.
In fact I can almost imagine the customer reaction to something like this - "Hi, I'm from IBM here to fix the broken XXXX. To start with, can I please use your computer to download a file from IBM and put it on a USB stick you'll have to provide, because we're not allowed to use USB storage any more". Depending on how important the repair was I'd even consider saying, "Um, no, you have a computer, figure it out".