The FiiO i1 isn’t any sturdier … the cable is no more substantial than the $9 Apple option.
That said, I’ve not had one of the Apple ones fail yet. I’m sure they do if they get tugged or snagged etc. But the one currently in the pouch with the QC20i goes all the way back to the iPhone 7 (came in the box), and has about a quarter-million flight-kilometers and well over 500 combined flight/airport hours on it.
It’d be nice if things like the DragonFly didn’t need the CCK. Won’t buy another that does, especially not after the Cobalt. Same with things like the E1DA 9038S.
At $9 for the Apple part, I bought a handful, stuck them in the pouches/cases with whatever they’d be driving, and forgot about them. If I was worried about failure, I’d stick a 2nd one in with the primary set and … forget about it.