I imagine he's talking about C1 mode in general being slower than C2 mode.

As for the question, I personally can not tell the difference between C1 and C2 mode. Another benefit is if you run two classes and run a external BEC like I do in electric then if you run a different receiver type in each class you can leave one plugged in ready to go while running the other one. Sometimes helps with getting back on the stand faster if you are back to back or makes it easier for someone to just turn the second car on for you while you leave the first in fail safe mode in back to back races.

Now all of the above shenanigans would not be needed if the radio and receiver would store a unique ID when binding and use that as part of the fail safe. The various 4PK versions do not do that. Any clue if this new Futaba radio does?