> For instance: they want to go to k8s because they want to use etcd/helm, which they can't on ECS? Why do you want to use etcd/helm? Is it really this important? Is there really no other way to achieve the goals of the company than exactly like that?

I'm no fan of Helm, but there are surprisingly few good alternatives to etcd (i.e. highly available but consistent datastores, suitable for e.g. the distributed equivalent of a .pid file) - Zookeeper is the only one that comes to mind, and it's a real pain on the ops side of things, requiring ancient JVM versions and being generally flaky even then.