OTH, a lot of folks brag about running extension cords and throwing manual transfer switches. It worked 9/9 times for me with less work.I doubt most people would accept an automatic transfer switch that fails 5 out of 9 times.
Yes, the 2.4 GHz spectrum is pretty crowded. It was one of the limited areas of the electromagnetic spectrum that the FCC (and the rest of the world) reserved for public use.But Bluetooth will always be the Achilles heel.