So far, no one has answered the original poster's question about what is unique about the 10X, other than the number of channels, that sets it apart from all the others. So, what is it that is unique about the 10X?

I won't knock the 10X since I own one and as yet have little experience with it. I do note, however, that from all of the above posts, that my Futaba FP8UAFS will do all of the things mentioned for the 10X except, again, duplicate it's number of channels.

Bumping a kill switch will not shut down an engine at idle or any other throttle setting. You have to hold the switch deflected a few seconds before it will "kill" an engine and it only kills an engine which has been brought down to idle. After a number of years of using the Futaba "Kill switch", I would not be without one. By the way, the 10X also has the engine kill ability. A buddy who uses the 10X has his programmed to a button on the top left of his transmitter.

Does anyone know for sure why JR does not allow the re-assignment of switches?

One more time, what is unique about the 10X that sets it apart from all the rest?