I'm still relatively new so I won't get into a bunch of technical blah blah but at the nd of the day, you do not make money just sitting around defending, so you will always see more offensive structures then defensive ones. Maybe this is a bit over simplified but sometimes the answer is right in front of your nose. PS- KaW staff, thanks for your dedication to making this an awesome game!
This update already cane out, this past Monday infact. It's not a download from the app store the changes just occured.