Communities have positive connotations and can achieve wonders (Ladd's Amish barn-raising and Texas hurricane example), but they can also trigger psychological effects that subvert critical thinking: members follow leaders and hold their ideas under less scrutiny, letting bad ideas proliferate. Want a culture where bad ideas can be called out in a friendly way (Ladd credits his colleague Scott with disabusing him of many bad ideas). When you find yourself above Rails for its god classes but then build god classes in event sourcing, the tooling was never the root cause — you were.