I’m sure you can also stream to it over a conventional wifi connection as well, the point of the dongle is so that they can guarantee a direct connection with lower latency and on a dedicated radio frequency to avoid interference, which is especially for non-techies who don’t know what they’re doing and just expect stuff to work out-of-the-box. The headset is just running SteamOS and has a regular wifi antenna, so I see no reason why you couldn’t stream to it using plain old Steam Link or whatever if you already know your connection can handle it.