At the time of development of the G30, the connection capabilities of Bluetooth were the most stable and reliable available.
Wi-Fi was still relatively new and did not satisfy the requirements of our technology at that time. You will find that our more recently launched equipment incorporates Wi-Fi as this has since become a widely used, superior means of connectivity..
We have a Wi-Fi bridge called the GCAST if you'd like to convert your controller to Wi-Fi instead of Bluetooth. Check it out here.