[Proposal] Wi-Fi Direct (Wi-Fi P2P) should also be used for the communication between Android Devices

[SeanXu1984]

I believe a lot Android devices still don't support Bluetooth Peripheral mode so relying only on BLE might exclude a lot of Android users.
But luckily, Wi-Fi Direct (also known as Wi-Fi P2P) is supported very well in all most every existing Android devices (Android 4.0 +)
Why not also include Wi-Fi Direct into the application to enable the direct communication between 2 nearby Android devices?

Android Devices <-> iOS Devices (BLE)
iOS Devices <-> Android Devices (BLE)
Android Devices <-> Android Devices (BLE + Wi-Fi Direct)

The following is a Github repo demonstrating how to use Wi-Fi Direct to send greetings between 2 Android Devices.
https://github.com/SeanXu1984/WifiDirectGreetings