With a rank, you can choose a map (Java), but it's annoying that some maps aren't open. By clicking on a closed map, that map should be the next one to open.
+ There will be longer queues if more maps will be open at the same timeThe selection of maps is because the server could not support with so many open maps and implementing your suggestion there would be a lot of lag in the network.
Also I disagree since the winfarmers would always enter the same map in parties for farming making the system collapse :/