This is sadly too little, too late for us. We started using ECS a while ago, and required us to write a lot of tooling to get what we needed (custom placements, etc). Needing to write more code to handle instance connection draining was the thing that pushed us to migrate our platform to Kubernetes.
ECS was great to get something up and running in a short amount of time, but compared to something like Kubernetes, it's still quite a way off.