The placement of my 2 'puters makes cable stringing difficult and clunky. Also, in my view, the addition of an extra box seems inelegant. A "swap PC" button wouldn't be required in my situation as the the machines are never in use at the time. A simple clone of the usb dongle transmitter would suffice nicely.
Really, it comes down to a question of control. You buy a piece of hardware; it's yours. If the hardware is capable, as it is here, why shouldn't you be able tailor it to your particular requirements? Because someone down at the factory has arbitrarily decided not doesn't seem a satisfactory answer.