It depends on car and budget. For me, I don't want joined brake pipes regardless of car age or condition.
My 1971 W113 needed new brake pipes, this car had been dealer serviced every year, for all its life and the dealer would have ordered the kit from Germany and cut it into 3 pieces and refitted it. Not for me, part of the cars value and provenance was its meticulous service over its 40k miles with myself and the original owner. So I sent the car back to the Heritage Customer Centre in Sindelfingen and had it done there at significant expense, by Mercedes, as it would/did come off the assembly line. There was other underbody work done (bushes, fasteners, and stripping and recoating of the underbody protection), it was well into 5 figures but in the case of such a vehicle it all came back on the value of the car.