I think you missed the point of the Wikipedia article. Structurelessness (and that is still what you're describing) leads to a tyranny where there are unspoken leaders who basically bully the rest of the organization. You described exactly that and then asked how to avoid it. Short answer: You probably can't. It's a human problem, not an organizational or process one.

Clear lines of ownership and responsibility do wonders for just letting coders code, and let everyone else decide what they code.