It can and should be implemented. If the AI is good enough, then no problem, no exploits.
It's just ridiculous to have destroyers patrol the seas ad infinitum. They should have to end their patrols at some point, go back to harbour and re-fuel, and then head back out to sea.
Same with cargo ships. They shouldn't pop out of nowhere and then disappear. They should dock, load/off-load, re-fuel, and then be on their way again when ready.
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