And at the other end of the MacBook, it seems the USB-C hardware has also changed. The cable is now perma-fixed to the USB board, condensing the two components into a single unit.
...Also, the silicon is new and moved from the cable itself to the USB board. Here's a comparison of the new USB-C hardware (top) with that of the 2015 Retina MacBook (bottom).
Parade Technologies PS8741A (likely an iteration of the PS8740 USB Type-C Redriving Switch)
This new USB and cable arrangement is one thing that's not compatible with previous Retina MacBooks.
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