If you need anything more than just ECS and you don't choose Kubernetes, you may end up rolling your own, in-house, less reliable subset of Kubernetes. You'll n

If you need anything more than just ECS and you don't choose Kubernetes, you may end up rolling your own, in-house, less reliable subset of Kubernetes. You'll need to train everyone how to use it, and how to understand how it works when something goes wrong. Choosing Kubernetes is like choosing Java -- it's a standard, there is a huge ecosystem of supporting software, the major cloud providers officially support it, and you can hire people who have worked with it before. Whether or not it's overkill is less important than those other factors.