Right now city traits feels half-baked. I like the idea, but it's not working well.
The first time I have an option to select a trait, it is for various things a t+20%. Straight forward.
The second time I have an option, it is for various things at +30%. This is where I'm confused:
* Does this replace the 20% bonus (i.e. I am refocusing in something else?)
* Does this add directly to the 20% (if I select the same thing, I get +50%?)
* Does this do something else?
Two additional problems:
1) I should be able to select a value, then have to click 'ok'. Currently, clicking on the value slections the option. This is not how the UI in the rest of the game works. This is an important choice --I shouldn't be locked into something because I accidentally clicked (which I did!)
2) I should be able to see information about the city, such as buildings and incomes, when presented with that selection screen.
Personally, I think that once a trait is selected, it should be permanent, with only that selected trait ever available. It's possible it could continue to scale up automatically. I also believe that it shouldn't be available until a L3 city.
Though I also really like the idea for automatic traits that someone else had.