Eh ... I think there's a lot of confusion over the best usecase of CCBs.
(Disclaimer, it's been years since I put enough track time in to have wished that I could afford CCBs. Now that I can, I can't find time to go play on the track anymore.
)
Most pure-track users don't use them: Iron's cheaper. No one cares about dust. Replacing the CCB rotors is stupid expensive, and even though rare, there's no real benefit. Iron works, is cheap enough to replace. You were running special pads/fluid anyway so no gain there ... has no real benefit.
Most pure-street drivers won't get any benefit either. Sure, you never have to replace your rotors ever, but it added $20k to the cost of the car to avoid spending $5k once during the ownership period, maybe. Yeah, maybe some slightly reduced brake dust, but ... ... eh? Maybe you get them to show off how rich you are, but otherwise it doesn't seem to make sense to me.
IMHO, they only make sense for rich-people who track their car regularly but not religiously. You can go from "a new set of rotors every year" to "eh ... I'll sell it before they're worn out". You can likely avoid using specialty pads and replacing pads for your track day. You don't destroy your wheels by baking brake dust into them. They are good for people who track a lot, but also street drive and value the ease of doing both without having to jack the car up between the two use cases.
Edit: A friend of mine who meets that third criteria did over 20 track days (HPDEs, A C7-ZR1 IIRC. About 2h of track-time per day. He pushes it really hard usually) and never replaced rotors, and only had to replace pads a very small number of times. He did run hard enough that he got a 2nd pair of wheels for the track-tires, but didn't trailer it to the track. Drove to track, drove around track, drove home. CCBs allowed him to use brake pads that worked well in both cases, and again never had to replace the rotors at all.