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Potentially in part because, until fairly recently (version 1.7 I believe), Django didn't have support for database schema migration built-in- https://docs.djangoproject.com/en/1.7/topics/migrations/

I see. If that's the only reason, not sure if it's a major problem with the ORM, given that you could use South instead with almost the same outcome.

The built-in migration code is even the continuation of South.