It also creates huge discrepancy between what a developer using an ORM like ActiveRecord writes and how the engines end up optimizing, meaning that should you w

It also creates huge discrepancy between what a developer using an ORM like ActiveRecord writes and how the engines end up optimizing, meaning that should you want to write a performant one, you have to learn both, or, short of that, notify your DBAs of what you did, and in both cases huge resources are wasted. I never understood combining both from a business perspective anyway.