What seems to happen a lot in the PCM vs. FM, or more properly PPM threads is there is a lot of confusion as to failsafe, how they work, etc. and that failsafe is not the same as PCM. Going to 2.4GHz spread doesn't by itself address the idea of failsafe. Of course there is no reason why a failsafe feature couldn't be added to 2.4GHz radios. The two freq RX you mention was required to get the link reliable enough to bring the product to market from my understanding. Yes, it's redundant, but I wouldn't read too much into that. There are technical issues on that band that will need to be addresses before you will see many 2.4GHz radios for planes. I'm sure they will probably be solved in the next several years... at least I hope so. Cheers