[pards]

> difficulties during data migrations

It's not difficult; it merely requires that you think about the order of the migration operations.

> He'd rather have a smooth data migration process than having an unexpected error

This should be grounds for dismissal. Data integrity problems should be dealt with immediately instead of making it someone else's problem later. He's just kicking that "unexpected error" down the road to some poor soul that will spend weeks trying to figure out how the data got so messed up.

If you don't care about data integrity then use a different data storage solution.