Just for quick context: I was mostly trying to say that any *simple* system may have benefits in the scenario when you don't have the resources to make a complex system work properly (read: userfriendly). A 7-member district was intended as shorthand for "out of these 70 people, pick 7 favorites". That does not allow as much nuance as ranking, but it also has much less mental load. There are more systems that would have been easier on the voter, most likely. I fear that with the 'rank these 70 people into an order of 70' will scare away too many participants.

Lodewijk