I agree that automatic material deliveries are a problem. They kill trade routes.
I've long argued that Port Battles, with their ever increasing set of Rube Goldbergesque rules to try to get them to work are nonsensical, unworkable and should be gotten rid of.
Robust trade routes and trade centers would organically drive PVP.
Alas, I think we'll get endless diddling with damage models for realism's sake, while the unnatural rule sets to try to solve time zones and port flipping lumbers on.
For now, with the upcoming closing of the "send capped ships to outpost" trick this might be a good move.