Everything in moderation

Stack Overflow’s commitment to purity has served it well. But if other platforms with a different — non-diabolical — culture offer what Stack Overflow does, then why stick to a place that is no longer the rare commodity it used to be?

Stack Overflow has enduring popularity, at least in software. Why is it that a resource like it — a centralized, global resource to ask questions — is not as common in other industries?