Consider this – If you damaged your car door, and you have to repair it, who is best skilled to do the job?
The manufacturer uses machinery, materials and automation processes to construct an entire component, however the repairer is skilled to remove damage and restore utilising totally different tools and skills for the job.
In carbon it is much the same, bikes are manufactured using a variety of machinery to mould semi-complete components which require assembly as well as inspect for manufacture anomalies. The repairer is equiped to identify fracture anomalies, largely not experienced by the manufacturer. The repairer utilises a variety of diagnostics and localised repair processes, again, uncommon to the manufacturer.
The two skill sets are unrelated and should not be confused with each other.