True, but we also know that the Borg have more advanced tech than the Federation, including nanoprobes/nanobots, which presumably would help in sealing re-fabricated parts together vs. having a technician weld them together. We also know from scenes inside Borg ships that the drones start moving around when repairs are needed, I assume performing some kind of labor related to the repairs.

Basically I don’t think replicator/transporter technology can solve the whole problem by itself, even for the Borg.