The new repair system allows for an interesting feature of increasing upkeep/repair cost over the ships life span, and giving the shipbuilders more business.
Ships that get damaged a lot could be more expensive to repair over and over again until needing a refit/rebuild at one point.
The refit/rebuild would lower the upkeep cost back to original amount.
It could also be another source of income for shipbuilders, maybe even the only way to refit/rebuild your ship.
Or you could also loose a durability by heavy use after some time if not refitted/rebuilt, which would again give an opportunity to shipbuilders to profit after they sold the ship (call it service).
You could pay less for the repairs/refits/rebuilds if done by the particular ships original builder. The captains would than have a reason to do more business with the original shipbuilder.
Discuss.