Remember mimouille: the KAEDE is open, does not block noise that much in comparison, and uses dynamic speakers. The sound is 100% different in presentation to CIEMs. It would be unfair to either one to compare them directly. There are certain things CIEMs to better; there are certain things the KAEDE does better. But one cannot replace the other in a setup where you rely on an earphone for its intrinsic characteristics.
Here's a real-world example:
You might like boxer shorts for lounging around in your house and airing out your boys. But if you go to play tennis, or any sport, wearing boxer shorts will only joggle your boys into mush. Now, I don't wear boxer shorts, and can't figure why anyone would, but some people swear by them. (Actually, they do, it's very interesting - and the reasons are completely dark to me.) I suppose if you don't move at all whilst playing sports, something like boxers might be okay, but otherwise, your floppy will turn your twins into painful gruel. Each (evidently) have their uses, but you'd never use boxers in a situation that requires cuddling, and you'd never use cuddling pants when loose balling is the order of the hour.