My 2 cents.
Given the abilities of modern COmputers and Microcontrollers It would not make sense for anything related to HID be "the fastest". HID stands for Human Interface Device. Humans are not really fast by any means.
The reason for these guaranteed transfer rates in HID modes is likely that there is a guaranteed response time to human interactions. If you push the mouse, you want for the cursor to move instantly (as perceived by a slow human ;-) ) and not experience lag until the the 4k video has been loaded from the USB Harddrive.
Given the abilities of modern COmputers and Microcontrollers It would not make sense for anything related to HID be "the fastest". HID stands for Human Interface Device. Humans are not really fast by any means.
The reason for these guaranteed transfer rates in HID modes is likely that there is a guaranteed response time to human interactions. If you push the mouse, you want for the cursor to move instantly (as perceived by a slow human ;-) ) and not experience lag until the the 4k video has been loaded from the USB Harddrive.