Thanks for providing the first somewhat reasonable argument that Apple could make in support of that design choice, other than cost cutting. What about USB 3.2 and 4? Also does USB 2 not produce any rfi?

I looked into it further, and couldn't get much info. It seems the USB organization is one of the main places for information on this potential issue, and their conclusion is;

"Improving the shielding on the USB 3.0 receptacle connector can help reduce the amount of noise radiated due to USB 3.0 signaling. In addition, shielding of the USB 3.0 peripheral device plays an important role in reducing the amount of noise radiated in the 2.4–2.5 GHz range. This is particularly critical for peripheral devices that are placed close to the PC platform, such as a flash drive. Placement of the wireless antenna should also be carefully considered on a platform and be located as far away as possible from a USB 3.0 connector and/or device."

Which makes sense to me. And Apple, the most profitable tech company in the world, seems to be best equipped to figure out how to shield their devices components to minimize or eliminate that issue.