Outside of a trusted FC run who agree to it, everyone bring a map and everyone need on everything regardless of owner works best for pugs. Maps are cheap and easy to gather, there's no reason to give someone who spent 30-40k the entire set of loot from a 7 floor canals. It also eliminates the risk that the party will get bored before their last member gets a turn, or the chance that one member will pop no canals from any of their maps. Also it means thieves maps are party property, which causes far less arguments.

I'm not saying I'm against the option if people really want it though. I'd just never personally use it.