There are literally compete turn-key solutions in AWS marketplace to most things any business needs to do that you don't need to be an engineer to use. A monkey who can read a walk-through with screenshots can build clusters of apps and CI/CD pipelines with AWS. And there are thousands of companies that you can pay to help manage your AWS resources.

Just because businesses hire dedicated backed people doesn't mean they actually need to, they just feel better about it when they do, because that's how it was always done before.