TBH a lot of this is subjective. Including productivity.

My other gripe too is productivity is only one aspect of software engineering. You also need to look at tech debt introduced and other aspects of quality.

Productivity also takes many forms so it's not super easy to quantify.

Finally... software engineers are far from being created equal. VERY big difference in what someone doing CRUD apps for a small web dev shop does vs. eg; an infra engineer in big tech.