This ideas can be very usefull for Stadia:
as U can connect any gamepad via BT on Android, so make the Stadia APP as a gamepad hub... so we can connect 8 gamepads with BT to the Android divice... to play Stadia... so the Stadia app will be a hub between gamepads and Stadia..
EXISTS: ANY Gamepad |------------------BT------------------| Stadia App |-------------------------------------WIFI------------|
EXISTS: STADIA Gamepad |---------------------------------------------------------------------------------------------WIFI------------|STADIA |------------WIFI----------| Chromecast / Chrome
EXISTS: ANY Gamepad |-------------cable------------| Chrome |-------------------------------------------------WIFI------------|
DOESNT: MULTIPLE Gamepads |-------BT-------| Stadia App (if with HUB posibilities) |-------WIFI------------|
DOESNT: ANY Gamepad |--------------cable-------------| Stadia Gamepad |----------------------------------WIFI-----------|
DOESNT: Stadia App Gamepad Simulator |-----------------------------------------------------------WIFI-----------|
DOESNT: STADIA Gamepad |---------WIFI-------| Stadia Windows Utility |--------------------| WINDOWS GAMES
DOESNT: STADIA Gamepad |--------WIFI-------| Play Store Games
DOESNT: STADIA Gamepad |---------WIFI-------| Android OS full control
DOESNT: Stadia App Gamepad Simulator |-------BT-----|Stadia Windows Utility /or Stadia App integrated as Chrome extention |--------------------| WINDOWS GAMES
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STADIA CONTROLLER IDEOLOGY
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Stadia Controller as a connection HUB:
The idea of this is making from the Stadia Controller, how it is now with the cable, a connecction HUB between not only 1 gamepad but multiple gamepads at the same time.
for example, in this case:
ANY Gamepad |--------------cable-------------| Stadia Gamepad |----------------------------------WIFI-----------|
the Stadia controller could have the BT connection with other gamepads as it has Android OS (google dev) and even the Stadia Controller could be the wireless(BT) HUB between ANY Gamepad and STADIA In this case, the Stadia Controller would be itself as a HUB...
XBOX / PS / ALLIExpress |----------------BT-----|
ANY Gamepad |---------------------------------BT-----| Stadia Gamepad |-------------WIFI-----------|STADIA
Stadia-App Gamepad Simulator |-------BT-----|