The cost of adding a feature isn't just the time it takes to code it. The cost also includes the addition of an obstacle to future expansion. The trick is to pick the features that don't fight each other.
“The left-wing, which consists of armoured and motorized forces and has no enemy in front of it, will be stopped dead in its tracks upon direct order from the Fuhrer.”
“I liked the fact that Lois was one person with Clark and another with Superman. I think that, as women, we do that a lot when we fall in love.”