What GingerBreadMan and 4DSC said is exactly right (and exactly wrong) IMO. In detailing there is no set schedule that you must follow, nor is there a set method or technique. What pleases and suits me may not be worth a darn for you.
Carnauba will provide a little protection to the Klasse that is protecting the paint, but during normal driving and washing there will be marring that will affect the Klasse and some that will affect the paint. At what point you want to strip everything off and start over is up to you. GingerBreadMan does it on a scheduled basis, I do mine on a much different pattern. About once a year I take it down to bare paint and go the whole route - clay, polish, protect - but after that I do it on a rotating basis, one section at a time based on the marring that magically appears.
It’s up to you to decide how anal you are about your paint, and how much work you can put into it before it becomes work that you don’t want to do. Try to get a good balance.