EKS is still... early. I'd rather manage myself with Kops or Terraform in its current stage. And in fact, that's what we do at my company.
I manage a few hundred worker nodes, they are heavily loaded at all times but happily chugging along. My pager is silent and has been for a while now. Last k8s issue we saw was actually our own fault, due to a misconfiguration.
I'm the kind of guy who enjoys Python 2.7 because it's deprecated, it's done changing :)
I try remember the maxim, Happiness is a Boring stack.
Also if you look at a container long enough and squint you will see the words serverless emerge.
I also had the “pleasure” of working with K8S. If anything, this looks like a pretty good play from Google to get you to eventually run your workloads in GCP.
Anyway go and try and build a typical application with Lambda/SAM. It is a nightmare of complexity and all you are doing is moving your logic to AWS where you pay 100x the cost of just running it yourself in a container.
And the idea that Kubernetes isn't mature is pretty laughable. It's used everyday by Netflix, eBay, Apple, Microsoft, IBM, Lyft, Uber, Square, Google, Pinterest, Stripe, Airbnb, Yahoo, Salesforce etc. And with AWS you have EKS which allows you to run containers in a HA and managed way.