With the current district policies, selecting the main 'graphical' district buttons as a silver player will put you in a silver district. This works fine, until new relatively new players who aren't aware of the 'advanced' tab unknowingly join an empty district, sit in it for an hour and stop playing the game because they think it's dead. This has become much more of an issue with the dwindling numbers we've been seeing recently.
I know this because I have personally talked to these people and taught them how to use the advanced district select tab.
Sure, both tabs have their place with the basic selection screen giving you information on the gamemodes and the advanced tab giving you info on threat/player count, but a simple UI tweak could easily combine these two.
While I understand this isn't the only thing holding back newcomers (high barrier of entry, learning curve), it surely does play a role.
Have a look at my suggested implementation: (imgur album)