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Since the signals on the USB-C connector are mirrored on each side with the CC pins indicating the plug orientation, does this mean that all USB-C devices have USB hubs so they can use the right D+/D- pair, or the right superspeed RX/TX pair?

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No, USB-C devices don't have to have USB hubs inside. The mirroring capability of Type-C connector is provided by a multiplexer, either embedded into the controller chip (at the expense of doubling super-speed interface pins), or using an external multiplexer IC like TI HD3S3212:

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Both sides of USB 2.0 data lines are simply connected in parallel at Type-C connector.

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