In utopia, defense is use to prevent against double tap(or triple). Have higher defense untill ppl cannot atk you and want to have high offense is illogical.Thats why theres thing like 40 dpa army out. Most kd set 40 dpa army out is because not many atker can have more then 80 opa, so 40 dpa is a save number to prevent against double tap.

When you get chain, fort is a bit useless, since you will get pitfall and after 2-3 atk, they already can double or triple tap.This is when gs come in,since you cannot defense your acre properly anymore, making their gain lesser is the way to go.In organize kd gs is use depend on kd strat in ghetto you can do that too.