That’s for sure since all parts are specific to the make and model. If I want a different seat post on my road bike (a 3T Strada with an aero seat post), I have the choice between 3T and 3T. On my older mountain bike (with a round seatpost), I can get anything. However, that’s not specific to Canyon, most bikes these days have some level of integration.
Finding a good LBS and keeping them in business isn’t easy. I paid a premium for my bike, because it was built up by a LBS. (In Japan, where I lived at the time, 3T bikes can be ordered direct-to-consumer or to certain LBSs. Not sure about other countries.)