I have never, ever seen dev-created infra that was well done, much less with repeatable IaC. It’s always résumé-driven nonsense based on whatever someone read on blogs, and they have no clue how any of it works, only that the output what they expect.
Could definitely be skewed by my time at AWS and working for companies that hire ex-AWS people, but I've never seen infra being the real third-party roadblock. I've always seen a design review -> IaC creation pipeline that's relatively fast.
Recently I've seen a lot of IaC created by dev, unfortunately. All vibe-coded, of course.