Sorry, that last part is absolutely not the case from my experience. IaC also uses the API to inquire about the infrastructure, and there are existing import/export tools around it, so I’m not exactly sure what you are gaining by insisting on abandoning it. IaC also has the benefit of being reusable and commitable.
It's largely because every devops situation is a snowflake and humans love to generalize. Turns out we don't all have the same problems. I haven't seen a startup that's been successful in devops at a level above the HCL / yaml