Perhaps you're better versed on the subject than myself. Admittedly, I only have 15+ years of hands on experience with ceramic coatings and thermal barriers on motorsport applications ranging from 5HP mini bikes to 5000HP twin turbo shoot out cars.I've been on boxers for almost ten years now. I've known dozens of riders who've had theirs coated and have seen testimonials and pictures from hundreds of other riders over the years online. My first R1200R (Hexhead) was Cermakromed and with the exception of some dulling (more like the first 4-6 inches) the coating held up brilliantly for over 20k miles and my shop assured me I could polish it back to like new if I was so inclined. I've never seen or heard anything to the contrary from other riders using their motorcycles under normal conditions.
As I previously stated, survival of the coating is contingent on the maximum realized temperature. Some bikes will be fine others will fail rather quickly. Restrictive exhaust and CAT's can negatively affect this as well. Further, most people don't get pipes back that look like a "bright chrome" as they should, so when the pipe dulls they don't notice as much of a difference in that it was never shiny to begin with. They don't notice a problem until they start to see little rust blisters or de-lamination. Although, you can polish the pipes "sometimes". The mere fact that they are dulling so bad indicates that the aluminum skin, "the weakest link" is oxidizing and potentially going into a sacrificial mode due to accelerated temperatures. So initially you may be able to get some shine back in it if you didn't over heat it too much. Eventually it will not be able to be polished. Also, recognize that the aluminum skin is only a few thousandths thick so you can't go crazy with it.
Another example of "exposed temps" is below. I would NEVER advocate anyone using a bright ceramic coating for a turbo or supercharged application in an automotive or motorcycle application. That being said, some limited race use cars and race or street driven bikes can get by for some time especially if they are lower boost applications. The twin turbo Busa below would normally be a "NO" candidate for bright, but since the bike has minimal bodywork and lower boost, similar applications have previously survived.