You're the first one I've seen mention marketboard problems in this thread (though I've seen the complaint elsewhere, and might have missed someone else's comments in this one).
I was addressing those complaining about the duty queues.
Right, that's what I was saying. The number of worlds isn't impacting duty queues. It would severely affect log in queues.
Having the population spread out between multiple worlds and data centers allows more players to log in at the same time. We know it's not solely at the logical data center level (though that's also a factor). At the start of the expansion Balmung players were facing multi-hour log in queues even though log in queues for Coeurl were rarely more than 5 minutes and we're on the same logical data center.
Does the quest requirement also apply to purchase of FC houses in those districts, or just personal houses/apartments? Considering the difference in purchase requirements between FC and personal, I'm not sure the quest would be needed for a FC house entry.
If the quest completion isn't needed, then it simply takes one high level RMT character buying an apartment in one of those districts then friending low level RMT characters so all those low level characters have access to at least that one ward.
