Did it require a special lightning cable (with more data pins) to use those speeds? If it was the standard cable, it's perplexing why Apple hasn't used that in every "Pro" iPhone/iPad.
When the iPad Pro was a host - ie you connect a usb 3 storage device to it via the camera connection kit - basically a lightning to USB adapter, you could get USB3 speeds.
But if you tried to connect it to your computer, it would be USB 2.
