Real issue though is that the grinders are only there to provide some token make-work for a few humans, and the whole shebang would be much better run by electronics batteries and a shore pilot.. So it's a pretty pointless exercise to say the least when the human is taken out of it.
Classic...
It's unfortunately like any set of rules, you try and write something simple, but then that spawns a subset of more restraints and interpretations, and each of those in turn will need another set ad infinitum as more of the rules are exploited.
It's called bureaucracy. Have a look at the...