Chromecast ultra was already existing before Stadia, they just used it, but the CCU itself doesn't have the connectivity necessary to connect in a realiabke and fast enough with a controller, this i...
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Chromecast ultra was already existing before Stadia, they just used it, but the CCU itself doesn't have the connectivity necessary to connect in a realiabke and fast enough with a controller, this is why the Stadia controller was added, it's the controller the send the signal to the Google server, they needed another piece of hardware to connect to the server and instead of splitting the two (creating a receiver for any controller AND the controllers) they went with the controller only, and the controller also let you to connect with the tandem mode which is both convenient and technically impressive as a solution, again you can play on PC with whatever you want because the pc has the software, the hardware and the power to deliver fast input to the Google servers, in case of stadia every millisecond counts, and the CCU is too slow in sending (its a receiver.)