I have tied to use automatic migrations and I do not see the point. Either your diff is trivial and it is trivial to write a migration or your diff is complex a

I have tied to use automatic migrations and I do not see the point. Either your diff is trivial and it is trivial to write a migration or your diff is complex and you have to care about the lock levels of schema changes, the time complexity of changes and that the migration transforms data correctly. The code generating the automatic migrations needs knowledge about the structure of the production data.