This is tricky. It is often said that it is cheaper and faster just to replace movement than repair them. Though true in some instances, it is not always the case. Parsec is a repair service. We repair even old LED watches that people said were non-repairable. In fact, it is our contention that in the majority of instances it takes just as long to properly replace a movement s to repair one. The new movement must still be tested, inspected, time (if possible and perhaps even lubricated. The dial must be places properly and hands properly installed, set, and aligned. Done properly and responsibly, this takes time.
Also, some movements simply are no longer available, and the only option is to service the existing movement. Further, some wearers prefer the original whenever possible.
So, there is a lot involved in this question.