I would say ORM is tough with code gen or with metaprogramming because it maps two mismatched paradigms (OOP and relational) and tries to paper over the differe

I would say ORM is tough with code gen or with metaprogramming because it maps two mismatched paradigms (OOP and relational) and tries to paper over the differences. I do agree on the debugging aspect - especially in dynamic languages - metaprogramming stack traces can be really hard to follow.