This feels like a dumb question, but is there nothing to distinguish the USB 2 port from the USB 3 port? I think there is an alert to tell people if they are using a fast device in the slow port, but I wonder whether their target market will read the manual and know which is which. I feel they will be surprised when that pop-up appears.
The Apple Take a tour of [the] MacBook Neo page describes the ports by location only:
"The left port can support one external display and transfers data at USB 3 speeds (up to 10 GB/s). The right port transfers data at USB 2 speeds (up to 480 MB/s). You can charge your MacBook Neo and connect accessories using either port."
...and...
"Tip: As a best practice, charge your MacBook Neo using the right port (USB 2), which leaves the left port (USB 3) available for a display or for connecting accessories that can take advantage of the higher speeds."
The target market rarely connects anything to their laptop besides the charger. The most commonly connected would be crappy flash drives or a mouse. A few might connect to present on a TV/projector but those are already frustrating to connect to.