And don't forget that WiFi can kill your radio signal and you want be able to fly far even if the lag was not so bad.
A friend thought he would fly and send a live feed to his phone. Bad mistake he ended up crashing when his signal was lost.
I was asking what happened, he told me he was using WiFi.... I told him that was the wrong thing to do with his 2.4 radio,
because the built-in Wi-Fi frequency is 2.4 GHz on the GoPro 3